Tuning proximity spin-orbit coupling in graphene/NbSe_2 heterostructures via twist angle
arxiv(2024)
摘要
We investigate the effect of the twist angle on the proximity spin-orbit
coupling (SOC) in graphene/NbSe_2 heterostructures from first principles. The
low-energy Dirac bands of several different commensurate twisted supercells are
fitted to a model Hamiltonian, allowing us to study the twist-angle dependency
of the SOC in detail. We predict that the magnitude of the Rashba SOC can
triple, when going from Θ=0^∘ to Θ=30^∘ twist angle.
Furthermore, at a twist angle of Θ≈23^∘ the in-plane spin
texture acquires a large radial component, corresponding to a Rashba angle of
up to Φ=25^∘. The twist-angle dependence of the extracted proximity
SOC is explained by analyzing the orbital decomposition of the Dirac states to
reveal with which NbSe_2 bands they hybridize strongest. Finally, we employ a
Kubo formula to evaluate the efficiency of conventional and unconventional
charge-to-spin conversion in the studied heterostructures.
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