Optimal charge-to-spin conversion in graphene on transition metal dichalcogenides

Abstract

When graphene is placed on a monolayer of semiconducting transition metal dichalcogenide (TMD) its band structure develops rich spin textures due to proximity spin-orbital effects with interfacial breaking of inversion symmetry. In this work, we show that the characteristic spin winding of low-energy states in graphene on TMD monolayer enables current-driven spin polarization known as the inverse spin galvanic effect (ISGE). By introducing a proper figure of merit, we quantify the efficiency of charge-to-spin conversion and show it is close to unity when the Fermi level approaches the spin minority band. Remarkably, at high electronic density, even though sub-bands with opposite spin helicities are occupied, the efficiency decays only algebraically. The giant ISGE predicted for graphene on TMD monolayer is robust against disorder and remains large at room temperature.

5 pages, 3 figures + supplemental material (5 pages, 4 figures); accepted version

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Cited by in corpus (12)

• Van der Waals heterostructures for spintronics and opto-spintronics
• Quantum Anomalous Hall Effects in Graphene from Proximity-Induced Uniform and Staggered Spin-Orbit and Exchange Coupling
• Gate tunability of highly efficient spin-to-charge conversion by spin Hall effect in graphene proximitized with WSe${}_2$
• Electrically Controlled Spin Injection from Giant Rashba Spin-Orbit Conductor BiTeBr
• Electric-field-tunable valley Zeeman effect in bilayer graphene heterostructures: Realization of the spin-orbit valve effect
• Experimental observation of spin-split energy dispersion in high-mobility single-layer graphene/WSe2 heterostructures
• Ultralong 100 ns Spin Relaxation Time in Graphite at Room Temperature
• Spin Hall and inverse spin galvanic effects in graphene with strong interfacial spin-orbit coupling: a quasi-classical Green's function approach
• Effect of proximity-induced spin-orbit coupling in graphene mesoscopic billiards
• Giant Valley-Polarized Spin Splittings in Magnetized Janus Pt Dichalcogenides
• Spin-charge conversion in disordered two-dimensional electron gases lacking inversion symmetry
• Charge-spin interconversion in graphene-based systems from density functional theory