Dissipationless spin-Hall current contribution in the extrinsic spin-Hall effect

• 来源期刊: 中国物理B（英文版）
• 关键词: extrinsic spin-Hall effect spin-orbit coupling induced by external electric fields dissipationless spin current
• 年，卷（期）: 2009,（7）
• 页码范围: 2981-2987
• 页数: 7页
• 语种: 英文

摘要

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.