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.

arXiv comment5 pages, 4 figures, Supplementary Information (13 pages, 7 figures)

References in corpus (40)

• Electric Field Effect in Atomically Thin Carbon Films
• Electronic spin transport and spin precession in single graphene layers at room temperature
• Graphene Spintronics
• Van der Waals heterostructures for spintronics and opto-spintronics
• Colloquium: Spintronics in graphene and other two-dimensional materials
• Strong interface-induced spin-orbit coupling in graphene on WS2
• Graphene on transition-metal dichalcogenides: a platform for proximity spin-orbit physics and optospintronics
• Spin-polarized current in non-collinear antiferromagnets
• Trivial and inverted Dirac bands, and emergence of quantum spin Hall states in graphene on transition-metal dichalcogenides
• Spin lifetimes exceeding 12 nanoseconds in graphene non-local spin valve devices
• Room temperature spin Hall effect in graphene/MoS${}_2$ van der Waals heterostructures
• Strongly anisotropic spin relaxation in graphene/transition metal dichalcogenide heterostructures at room temperature
• Spin-orbit torques in Co/Pt(111) and Mn/W(001) magnetic bilayers from first principles
• Charge-to-Spin Conversion by the Rashba-Edelstein Effect in 2D van der Waals Heterostructures up to Room Temperature
• Giant Spin Lifetime Anisotropy in Graphene Induced by Proximity Effects
• Large Proximity-Induced Spin Lifetime Anisotropy in Transition Metal Dichalcogenide/Graphene Heterostructures
• Spin transport in graphene/transition metal dichalcogenide heterostructures
• Model spin-orbit coupling Hamiltonians for graphene systems
• Tunable room-temperature spin galvanic and spin Hall effects in van der Waals heterostructures
• Tunable spin-orbit coupling and symmetry-protected edge states in graphene/WS${}_2$
• Large spin relaxation anisotropy and valley-Zeeman spin-orbit coupling in WSe2/Gr/hBN heterostructures
• Twist-angle dependence of the proximity spin-orbit coupling in graphene on transition-metal dichalcogenides
• Optimal charge-to-spin conversion in graphene on transition metal dichalcogenides
• First-principles investigation of graphene/MoS2 bilayer heterostructures using Tkatchenko-Scheffler van der Waals method
• Induced spin-orbit coupling in twisted graphene-TMDC heterobilayers: twistronics meets spintronics
• Strong Spin-Orbit Interaction Induced in Graphene by Monolayer WS${}_2$
• Spin Hall effect and Weak Antilocalization in Graphene/Transition Metal Dichalcogenide Heterostructures
• Large multi-directional spin-to-charge conversion in low symmetry semimetal MoTe${}_2$ at room temperature
• Twist-angle dependent proximity induced spin-orbit coupling in graphene/transition-metal dichalcogenide heterostructures
• Intraband and interband spin-orbit torques in non-centrosymmetric ferromagnets
• Electrical control of valley-Zeeman spin-orbit coupling-induced spin precession at room temperature
• Gate-Tunable Reversible Rashba-Edelstein Effect in a Few-Layer Graphene/2H-TaS2 Heterostructure at Room Temperature
• 98% directional guiding of spin currents with 90 micrometer relaxation length in bilayer graphene using carrier drift
• Covariant conservation laws and the spin Hall effect in Dirac-Rashba systems
• 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
• Twist Angle Controlled Collinear Edelstein Effect in van der Waals Heterostructures
• Omnidirectional spin-to-charge conversion in graphene/NbSe${}_2$ van der Waals heterostructures
• Manipulation of Spin Transport in Graphene/Transition Metal Dichalcogenide Heterobilayers upon Twisting
• Resolving spin currents and spin densities generated by charge-spin interconversion in systems with reduced crystal symmetry

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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