Semiclassical Boltzmann theory of spin Hall effects in giant Rashba systems  

作　　者：Cong Xiao 

机构地区：[1]Department of Physics, The University of Texas at Austin, Austin, TX 78712-0264, USA

出　　处：《Frontiers of physics》2018年第2期145-151,共7页物理学前沿（英文版）

摘　　要：For the spin Hall effect arising from strong band-structure spin-orbit coupling, a semiclassical Boltz- mann theory reasonably addressing the intriguing disorder effect called side-jump has not yet been developed. This paper describes such a theory in which the key ingredient is the spin-current counter- part of the semiclassical side-jump velocity （introduced in the context of the anomalous Hall effect）. Applying this theory to spin Hall effects in a two-dimensional electron gas with giant Rashba spin-orbit coupling, largely enhanced spin Hall angle is found in the presence of magnetic impurities when only the lower Rashba band is partially occupied.For the spin Hall effect arising from strong band-structure spin-orbit coupling, a semiclassical Boltz- mann theory reasonably addressing the intriguing disorder effect called side-jump has not yet been developed. This paper describes such a theory in which the key ingredient is the spin-current counter- part of the semiclassical side-jump velocity （introduced in the context of the anomalous Hall effect）. Applying this theory to spin Hall effects in a two-dimensional electron gas with giant Rashba spin-orbit coupling, largely enhanced spin Hall angle is found in the presence of magnetic impurities when only the lower Rashba band is partially occupied.

关 键 词：spin Hall effect semiclassical Boltzmann theory side jump Rashba spin-obit coupling 

分 类 号：TP274.2[自动化与计算机技术—检测技术与自动化装置] N94[自动化与计算机技术—控制科学与工程]