Charge-to-spin conversion in twisted graphene/WSe${}_2$ heterostructures

Abstract

We investigate the twist angle dependence of spin-orbit coupling (SOC) proximity effects and charge-to-spin conversion (CSC) in graphene/WSe${}_2$ heterostructures from first principles. The CSC is shown to strongly depend on the twist angle, with both the spin Hall and standard Rashba-Edelstein efficiencies optimized at or near 30° twisting. Symmetry breaking due to twisting also gives rise to an unconventional Rashba-Edelstein effect, with electrically generated non-equilibrium spin densities possessing spins collinear to the applied electric field. We further discuss how the carrier doping concentration and band broadening control the crossover between the Fermi-sea and -surface spin response, which reconciles the seemingly disparate experimental observations of different CSC phenomena.

5 pages, 4 figures, Supplementary Information (13 pages, 7 figures)

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• Tunable spin-orbit coupling and symmetry-protected edge states in graphene/WS${}_2$
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• Spin Hall effect and Weak Antilocalization in Graphene/Transition Metal Dichalcogenide Heterostructures
• Intraband and interband spin-orbit torques in non-centrosymmetric ferromagnets
• Gate tunability of highly efficient spin-to-charge conversion by spin Hall effect in graphene proximitized with WSe${}_2$
• A new decomposition of the Kubo-Bastin formula
• Resolving spin currents and spin densities generated by charge-spin interconversion in systems with reduced crystal symmetry

Cited by in corpus (26)

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• Twist-angle tunable spin texture in WSe${}_2$/graphene van der Waals heterostructures
• Strong manipulation of the valley splitting upon twisting and gating in MoSe${}_2$/CrI${}_3$ and WSe${}_2$/CrI${}_3$ van der Waals heterostructures
• Unconventional charge-to-spin conversions in graphene/MoTe2 van der Waals heterostructures
• Twist-angle dependent proximity induced spin-orbit coupling in graphene/topological insulator heterostructures
• Spin and orbital Edelstein effect in a bilayer system with Rashba interaction
• Spin-orbit and exchange proximity couplings in graphene/1T-TaS${}_2$ heterostructure triggered by a charge density wave
• Control of charge-spin interconversion in van der Waals heterostructures with chiral charge density waves
• Observation of time-reversal symmetric Hall effect in graphene-WSe2 heterostructures at room temperature
• Gate-tunable spin Hall effect in an all-light-element heterostructure: graphene with copper oxide
• Spin Hall Effect: Symmetry Breaking, Twisting, and Giant Disorder Renormalization
• Giant asymmetric proximity-induced spin-orbit coupling in twisted graphene/SnTe heterostructure
• Tunable superconductivity and Möbius Fermi surfaces in an inversion-symmetric twisted van der Waals heterostructure
• Proximity-induced spin-orbit coupling in phosphorene on a WSe${}_2$ monolayer
• Gate-tunable spin Hall effect in trilayer graphene/group-IV monochalcogenide van der Waals heterostructures
• Moiré Collapse and Luttinger Liquids In Twisted Anisotropic Homobilayers
• Out-of-plane spin-to-charge conversion at low temperatures in graphene/MoTe${}_2$ heterostructures
• Transport Signatures of Radial Rashba Spin-Orbit Coupling at Ferromagnet/Superconductor Interfaces
• Current-induced spin and orbital polarization in the ferroelectric Rashba semiconductor GeTe
• Ferroelectric switching control of spin current in graphene proximitized by In${}_2$Se${}_3$
• Displacement-field-tunable superconductivity in an inversion-symmetric twisted van der Waals heterostructure
• Topological phases, van Hove singularities, and spin texture in magic-angle twisted bilayer graphene in the presence of proximity-induced spin-orbit couplings
• Designer spin-orbit superlattices: symmetry-protected Dirac cones and spin Berry curvature in two-dimensional van der Waals metamaterials
• Room-temperature spin-lifetime anisotropy exceeding 60 in bilayer graphene spin valves proximity coupled to WSe${}_2$
• Gate tunable spin-charge interconversion in a graphene/ReS${}_2$ heterostructure up to room temperature
• Radial Rashba spin-orbit fields in commensurate twisted transition-metal dichalcogenide bilayers