Spin polarization control by electric field gradients

Details Spin polarization control by electric field gradients Spin polarization control by electric field gradients

2006-02-11

arxiv.org/abs/cond-mat/0602284v3

Phys. Rev. B 74, 155207 (2006)

Physics

Condensed Matter

Materials Science

7 pages, 4 figures; updated and extended version, added figure, updated reference list

Scientific paper

10.1103/PhysRevB.74.155207

We show that the propagation of spin polarized carriers may be dramatically affected by {\em inhomogeneous} electric fields. Surprisingly, the spin diffusion length is found to strongly depend on the sign and magnitude of electric field \emph{gradients}, in addition to the previously reported dependence on the sign and magnitude of the electric field [Yu & Flatt\'e, Phys. Rev. B {\bf 66}, 201202(R) 2002; {\em ibid.} {\bf 66}, 235302 (2002)]. This indicates that purely electrical effects may play a crucial role in spin polarized injection, transport and detection in semiconductor spintronics. A generalized drift-diffusion equation that describes our findings is derived and verified by numerical calculations using the Boltzmann transport equation.

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