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

作　　者：颜玉珍 李辉武 胡梁宾 

机构地区：[1]Laboratory of Quantum Information Technology,School of Physics and Telecommunication Engineering,South China Normal University

出　　处：《Chinese Physics B》2009年第7期2981-2987,共7页中国物理B（英文版）

基　　金：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);the Natural Science Foundation of Guangdong Province of China (Grant No07005834)

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.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.

关 键 词：extrinsic spin-Hall effect spin-orbit coupling induced by external electric fields dissi-pationless spin current 

分 类 号：O469[理学—凝聚态物理]