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arXiv 0810.2892cond-mat.mes-hallcond-mat.dis-nn
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二维电子系统中自旋相关的电子-杂质散射

Spin-dependent electron-impurity scattering in two-dimensional electron systems

A. Pályi, J. Cserti

摘要:

本文从理论上研究了二维电子气附近带电杂质引起的电子自旋弹性散射。我们发现,自旋相关的微分散射截面的对称性是不同的杂质位于电子气的平面和一个在一个有限的距离从平面。我们表明,在后一种情况下,如果入射电子的极化在二维电子气的法向矢量和初始传播方向所跨越的平面上有一个有限的投影,则会出现非对称(“偏斜”)散射。在特殊处理的样品中,这种散射机制可能会在面内磁场的存在下产生类霍尔效应。

英文摘要:

We present a theoretical study of elastic spin-dependent electron scattering caused by a charged impurity in the vicinity of a two-dimensional electron gas. We find that the symmetry properties of the spin-dependent differential scattering cross section are different for an impurity located in the plane of the electron gas and for one at a finite distance from the plane. We show that in the latter case asymmetric (`skew') scattering can arise if the polarization of the incident electron has a finite projection on the plane spanned by the normal vector of the two-dimensional electron gas and the initial propagation direction. In specially preparated samples this scattering mechanism may give rise to a Hall-like effect in the presence of an in-plane magnetic field.

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