Arne Brataas et al 2007 New J. Phys. 9 345 doi:10.1088/1367-2630/9/9/345
Spin injection in quantum wells with spatially dependent rashba interaction
Focus on Spintronics in Reduced DimensionsArne Brataas1,2, A G Mal'shukov1,3 and Yaroslav Tserkovnyak1,4
Show affiliationsPart of Focus on Spintronics in Reduced Dimensions
We consider Rashba spin–orbit effects on spin transport driven by an electric field in semiconductor quantum wells. We derive spin diffusion equations that are valid when the mean free path and the Rashba spin–orbit interaction vary on length scales larger than the mean free path in the weak spin–orbit coupling limit. From these general diffusion equations, we derive boundary conditions between regions of different spin–orbit couplings. We show that spin injection is feasible when the electric field is perpendicular to the boundary between two regions. When the electric field is parallel to the boundary, spin injection only occurs when the mean free path changes within the boundary, in agreement with the recent work by Tserkovnyak et al (Preprint cond-mat/0610190).
- PACS
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71.70.Ej Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect
72.25.Dc Spin polarized transport in semiconductors
72.20.Jv Charge carriers: generation, recombination, lifetime, and trapping
- Subjects
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Condensed matter: electrical, magnetic and optical
- Dates
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Issue 9 (September 2007)
Received 23 April 2007
Published 28 September 2007
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Spin injection in quantum wells with spatially dependent rashba interaction
Arne Brataas et al 2007 New J. Phys. 9 345
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