Boundary conditions for spin and charge diffusion in the presence of interfacial spin-orbit coupling
Abstract
Breaking of the inversion symmetry at the interface between different materials may dramatically enhance spin-orbit interaction in the vicinity of the interface. We incorporate the effects of this interfacial spin-orbit coupling (ISOC) into the standard drift-diffusion theory by deriving generalized boundary conditions for diffusion equations. Our theoretical scheme is based on symmetry arguments, providing a natural classification and parametrization of all spin-charge and spin-spin conversion effects that occur due to ISOC at macroscopically isotropic interfaces between nonmagnetic materials. We illustrate our approach with specific examples of spin-charge conversion in hybrid structures. In particular, for a lateral metal-insulator structure we predict an "ISOC-gating" effect which can be used to detect spin currents in metallic films with weak bulk SOC.
Keywords
Cite
@article{arxiv.1903.12592,
title = {Boundary conditions for spin and charge diffusion in the presence of interfacial spin-orbit coupling},
author = {Juan Borge and Ilya V. Tokatly},
journal= {arXiv preprint arXiv:1903.12592},
year = {2019}
}