Dissipationless spin-Hall current contribution in the extrinsic spin-Hall effect
Yan Yu-Zhen(颜玉珍), Li Hui-Wu(李辉武), and Hu Liang-Bin(胡梁宾)†
Laboratory of Quantum Information Technology, School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510631, China
Abstract This paper shows that a substantial amount of dissipationless spin-Hall current contribution may exist in the extrinsic spin-Hall effect, which originates from the spin-orbit coupling induced by the applied external electric field itself that drives the extrinsic spin-Hall effect in a nonmagnetic semiconductor (or metal). By assuming that the impurity density is in a moderate range such that the total scattering potential due to all randomly distributed impurities is a smooth function of the space coordinate, it is shown that this dissipationless contribution shall be of the same orders of magnitude as the usual extrinsic contribution from spin-orbit dependent impurity scatterings (or may even be larger than the latter one). The theoretical results obtained are in good agreement with recent relevant experimental results.
Received: 22 December 2008
Revised: 20 January 2009
Accepted manuscript online:
PACS:
72.20.My
(Galvanomagnetic and other magnetotransport effects)
Fund: Project supported by the National
Natural Science Foundation of China (Grant No 10874049), the State
Key Program for Basic Research of China (Grant No 2007CB925204) and
the Natural Science Foundation
of Guangdong Province of China (Grant No 07005834).
Cite this article:
Yan Yu-Zhen(颜玉珍), Li Hui-Wu(李辉武), and Hu Liang-Bin(胡梁宾) Dissipationless spin-Hall current contribution in the extrinsic spin-Hall effect 2009 Chin. Phys. B 18 2981
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