Theory of conserved spin current and its application to a two-dimensional hole gas

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	Theory of conserved spin current and its application to a two-dimensional hole gas
	Zhang, P ; Wang, ZG ; Shi, JR ; Xiao, D ; Niu, Q
刊名	PHYSICAL REVIEW B
	2008
卷号	77 期号:7
ISSN号	1098-0121
通讯作者	Hao, H (reprint author), Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China.
中文摘要	We present a detailed microscopic theory of the conserved spin current which is introduced by us [Phys. Rev. Lett. 96, 076604 (2006)] and satisfies the spin continuity equation even for spin-orbit coupled systems. The spin-transport coefficients sigma(s)(mu nu) as a response to the electric field are shown to consist of two parts, i.e., the conventional part sigma(s0)(mu nu) and the spin-torque-dipole correction sigma(s tau)(mu nu). As one key result, an Onsager relation between sigma(s)(mu nu) and other kinds of transport coefficients is shown. The expression for sigma(s)(mu nu) in terms of single-particle Bloch states is derived, by use of which we study the conserved spin-Hall conductivity in the two-dimensional hole gas modeled by a combined Luttinger and space-inversion asymmetric Rashba spin-orbit coupling. It is shown that the two components in spin-Hall conductivity usually have the opposite contributions. While in the absence of Rashba spin splitting the spin-Hall transport is dominated by the conventional contribution, the presence of Rashba spin splitting stirs up a large enhancement of the spin-torque-dipole correction, leading to an overall sign change for the total spin-Hall conductivity. Furthermore, an approximate two-band calculation and the subsequent comparison with the exact four-band results are given, which reveals that the coupling between the heavy-hole and light-hole bands should be taken into account for strong Rashba spin splitting.
收录类别	SCI
公开日期	2013-09-23
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/45682]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Zhang, P,Wang, ZG,Shi, JR,et al. Theory of conserved spin current and its application to a two-dimensional hole gas[J]. PHYSICAL REVIEW B,2008,77(7).
APA	Zhang, P,Wang, ZG,Shi, JR,Xiao, D,&Niu, Q.(2008).Theory of conserved spin current and its application to a two-dimensional hole gas.PHYSICAL REVIEW B,77(7).
MLA	Zhang, P,et al."Theory of conserved spin current and its application to a two-dimensional hole gas".PHYSICAL REVIEW B 77.7(2008).