Boundary conditions for spin diffusion

Details Boundary conditions for spin diffusion Boundary conditions for spin diffusion

2006-01-30

arxiv.org/abs/cond-mat/0601677v4

Phys. Rev. B 74, 115331 (2006)

Physics

Condensed Matter

Materials Science

6 pages; replaced with a published version

Scientific paper

10.1103/PhysRevB.74.115331

We develop a general scheme of deriving boundary conditions for spin-charge coupled transport in disordered systems with spin-orbit interactions. To illustrate the application of the method, we explicitly derive boundary conditions for spin diffusion in the Rashba model. Due to the surface spin precession, the boundary conditions are non-trivial and contain terms, which couple different components of the spin density. We argue that boundary conditions and the corresponding electric-field-induced spin accumulation generally depend on the nature of the boundary and therefore the spin Hall effect in a spin-orbit coupled system can be viewed as a non-universal edge phenomenon.

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