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Boundary Spin Hall Effect in a Rashba Semiconductor | | Yaroslav Tserkovnyak
; Bertrand I. Halperin
; Alexey A. Kovalev
; Arne Brataas
; | | Date: |
6 Oct 2006 | | Subject: | Materials Science | | Abstract: | We derive boundary conditions for the coupled spin-charge diffusion equations at a transmitting interface between two-dimensional electron systems with different strengths of the Rashba spin-orbit (SO) coupling $alpha$, and an electric field parallel to the interface. We consider the limit where the spin-diffusion length $l_s$ is long compared to the electron mean free path $l$, and assume that $alpha$ changes discontinuously on the scale of $l_s$. We find that the spin density is also discontinuous on the scale of $l_s$. In the case where the electron mobility is constant across the interface, this leads to complete suppression of the expected spin injection from a region with $alpha
eq0$ into a non-SO region with $alpha=0$. | | Source: | arXiv, cond-mat/0610190 | | Services: | Forum | Review | PDF | Favorites | |
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