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Spin accumulation on a one-dimensional mesoscopic Rashba ring
- Source :
- Journal of Physics: Condensed Matter. 18:4101-4109
- Publication Year :
- 2006
- Publisher :
- IOP Publishing, 2006.
-
Abstract
- The nonequilibrium spin accumulation on a one-dimensional (1D) mesoscopic Rashba ring is investigated with unpolarized current injected through ideal leads. Due to the Rashba spin-orbit (SO) coupling and back-scattering at the interfaces between the leads and the ring, a beating pattern is formed in the fast oscillation of spin accumulation. If every beating period is complete, a plateau is formed, where the variation of spin accumulation with the external voltage is slow, but if new incomplete periods emerge in the envelope function, a transitional region appears. This plateau structure and the beating pattern are related to the tunnelling through spin-dependent resonant states. Because of the Aharonov-Casher (AC) effect, the average spin accumulation oscillates quasi-periodically with the Rashba SO coupling and has a series of zeros. In some situations, the direction of the average spin accumulation can be reversed by the external voltage in this 1D Rashba ring.
Details
- ISSN :
- 1361648X and 09538984
- Volume :
- 18
- Database :
- OpenAIRE
- Journal :
- Journal of Physics: Condensed Matter
- Accession number :
- edsair.doi.dedup.....a356d92325bdb02c423d0e896de70b59