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arXiv 0710.2866cond-mat.mtrl-sci
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对称量子阱中子带间自旋轨道耦合和自旋劈裂

Intersubband spin-orbit coupling and spin splitting in symmetric quantum wells

F. V. Kyrychenko, C. A. Ullrich, I. D'Amico

摘要:

在具有反转不对称性的半导体中,自旋-轨道耦合引起了众所周知的Dresselhaus和Rashba效应。如果考虑具有两个或更多个传导子带的量子阱,则会出现额外的子带间诱导的自旋轨道项,其强度与Rashba耦合相当,并且对于对称结构仍然是有限的。我们表明,导带自旋分裂由于这个子带间的自旋轨道耦合项是可以忽略不计的典型的III-V量子阱。

英文摘要:

In semiconductors with inversion asymmetry, spin-orbit coupling gives rise to the well-known Dresselhaus and Rashba effects. If one considers quantum wells with two or more conduction subbands, an additional, intersubband-induced spin-orbit term appears whose strength is comparable to the Rashba coupling, and which remains finite for symmetric structures. We show that the conduction band spin splitting due to this intersubband spin-orbit coupling term is negligible for typical III-V quantum wells.

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