Theory of spin-charge-coupled transport in proximitized graphene: An SO(5) algebraic approach
arXiv:2108.05559 · doi:10.1088/2515-7639/ac31b5
Abstract
Establishing the conditions under which orbital, spin and lattice-pseudospin degrees of freedom are mutually coupled in realistic nonequilibrium conditions is a major goal in the emergent field of graphene spintronics. Here, we use linear-response theory to obtain a unified microscopic description of spin dynamics and coupled spin-charge transport in graphene with an interface-induced Bychkov-Rashba effect. Our method makes use of an SO(5) extension of the familiar inverse-diffuson approach to obtain a quantum kinetic equation for the single-particle density matrix that treats spin and pseudospin on equal footing and is valid for arbitrary external perturbations. As an application of the formalism, we derive a complete set of drift-diffusion equations for proximitized graphene with scalar impurities in the presence of electric and spin-injection fields which vary slowly in space and time. Our approach is amenable to a wide variety of generalizations, including the study of coupled spin-charge dynamics in layered materials with strong spin-valley coupling and spin-orbit torques in van der Waals heterostructures.
arXiv comment23 pages, 3 figures (typos corrected; accepted version in IOP J. Phys. Mater.)
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