Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-08-06
PRL 96, p. 056602 (2006)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, RevTex, 1 Fig
Scientific paper
We have described the electron spin dynamics in the presence of the spin-orbit interaction and disorder using the spin-density matrix method. We showed that in the Born approximation in the scattering amplitude the spin current is zero for an arbitrary ratio of the spin-orbit splitting and the scattering rate. Various types of the disorder potential are studied. We argue that the bulk spin current has always an {\it extrinsic} nature and depends explicitely on scattering by impurities since it appears only beyond the Born approximation in the scattering amplitude.
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