Surface orbitronics: new twists from orbital Rashba physics

Abstract

When the inversion symmetry is broken at a surface, spin-orbit interaction gives rise to spin-dependent energy shifts - a phenomenon which is known as the spin Rashba effect. Recently, it has been recognized that an orbital counterpart of the spin Rashba effect - the orbital Rashba effect - can be realized at surfaces even without spin- orbit coupling. Here, we propose a mechanism for the orbital Rashba effect based on sp orbital hybridization, which ultimately leads to the electric polarization of surface states. As a proof of principle, we show from first principles that this effect leads to chiral orbital textures in $\mathbf{k}$-space of the BiAg${}_2$ monolayer. In predicting the magnitude of the orbital moment arising from the orbital Rashba effect, we demonstrate the crucial role that the Berry phase theory plays for the magnitude and variation of the orbital textures. As a result, we predict a pronounced manifestation of various orbital effects at surfaces, and proclaim the orbital Rashba effect to be a key platform for surface orbitronics.

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• Orbitally Dominated Rashba-Edelstein Effect in Noncentrosymmetric Antiferromagnets
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• Orbital Hall Insulating Phase in Transition Metal Dichalcogenide Monolayers
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• Two-dimensional orbital Hall insulators
• Orbital Torque in Rare-Earth Transition-Metal Ferrimagnets
• Adiabatically Induced Orbital Magnetization
• Direct visualization of Rashba-split bands and spin/orbital-charge interconversion at KTaO${}_3$ interfaces
• Electrically Tunable Superconductivity Through Surface Orbital Polarization
• Momentum-space signatures of Berry flux monopoles in a Weyl semimetal
• Orbital Hall effect and orbital edge states caused by s electrons
• Orbital angular momentum of Bloch electrons: equilibrium formulation, magneto-electric phenomena, and the orbital Hall effect
• Colossal orbital-Edelstein effect in non-centrosymmetric superconductors
• Engineering Chiral and Topological Orbital Magnetism of Domain Walls and Skyrmions
• Unidirectional orbital magnetoresistance in light metal/ferromagnet bilayers
• Orbital magnetoelectric effect in zigzag nanoribbons of p-band systems
• Exploring orbital-charge conversion mediated by interfaces with copper through spin-orbital pumping
• Role of Disorder in the Intrinsic Orbital Hall Effect
• Orbital Pumping Incorporating Both Orbital Angular Momentum and Position
• Spectroscopic Signatures of Gate-Controlled Superconducting Phases
• Orbital Rashba effect as a platform for robust orbital photocurrents
• Large Chiral Orbital Texture and Orbital Edelstein Effect in Co/Al Heterostructure
• Spin and orbital Edelstein effect in a bilayer system with Rashba interaction
• Orbital pseudospin-momentum locking in two-dimensional chiral borophene
• First-principles theory of giant Rashba-like spin-splitting in bulk ferroelectrics
• Electrically switchable hidden spin polarization in antiferroelectric crystals
• Role of orbital hybridization in anisotropic magnetoresistance
• Evidence of Ultrashort Orbital Transport in Heavy Metals Revealed by Terahertz Emission Spectroscopy
• Chirality-induced orbital Edelstein effect in an analytically solvable model
• Nonlocal Electrical Detection of Reciprocal Orbital Edelstein Effect
• Laser-induced charge and spin photocurrents at BiAg${}_2$ surface: a first principles benchmark
• Orbital quantum magnetism in spin dynamics of strongly interacting magnetic lanthanide atoms
• Effects of Boundary on Orbital Magnetization for a Bilayer System with Different Chern Numbers
• Theory of spin and orbital charge conversion at the surface states of Bi_{1-x}Sb_x topological insulator
• Engineering spin-orbit effects and Berry curvature by deposition of Eu on WSe${}_2$
• Current-induced spin and orbital polarization in the ferroelectric Rashba semiconductor GeTe
• Anatomy of torques from orbital Rashba textures: the case of Co/Al interfaces
• Light-induced Orbital and Spin Magnetism in $3d$, $4d$, and $5d$ Transition Metals
• Chirality-induced selectivity of angular momentum by orbital Edelstein effect in carbon nanotubes
• Filtering Spin and Orbital Moment in Centrosymmetric Systems
• Two-dimensional electron gas in a metal/amorphous oxide interface with spin orbit interaction
• Orbital currents in lattice multiorbital systems: Continuity equation, torques, and RKKY interaction
• Spin texture tunability in Mn${}_{1-x}$Ge${}_x$Bi${}_2$Te${}_4$ through varying Ge Concentration
• Three-dimensional topological orbital Hall effect caused by magnetic hopfions
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• Nonlinear spin and orbital Rashba-Edelstein effects induced by a femtosecond laser pulse: Simulations for Au(001)
• Beyond spin-1/2: Multipolar spin-orbit coupling in noncentrosymmetric crystals with time-reversal symmetry
• Chiral orbital/spin textures and Edelstein effects in monolayer Janus TMDs
• Orbital Dynamics in Centrosymmetric Systems