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arXiv 0910.3050cond-mat.mes-hall
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一般二维电子系统的电流感生自旋极化

Current-induced spin polarization for a general two-dimensional electron system

C. M. Wang, H. T. Cui, Q. Lin

摘要:

本文研究了具有一般自旋轨道相互作用的二维电子气的电流诱导自旋极化。对于各向同性能谱,非线性自旋-轨道相互作用的面内电流诱导自旋极化与电子密度有关,并且随着面密度的增加而增加,而对于$\bm k$ -线性自旋-轨道耦合模型则相反.对线性和立方自旋轨道耦合的InAs/InSb异质结进行了数值计算。对于$δ$型短程电子-杂质散射,当考虑立方自旋轨道耦合时,发现电流诱导的自旋极化随密度的增加而增加。然而,对于远程的障碍,一个快速增强的电流诱导的自旋极化总是观察到在高电子密度,即使在没有立方自旋轨道耦合的情况下。这一结果表明了电流诱导自旋极化的碰撞相关特征。不同的高阶自旋轨道耦合对自旋极化的影响是可以比较的。

英文摘要:

In this paper, current-induced spin polarization for two-dimensional electron gas with a general spin-orbit interaction is investigated. For isotropic energy spectrum, the in-plane current-induced spin polarization is found to be dependent on the electron density for non-linear spin-orbit interaction and increases with the increment of sheet density, in contrast to the case for $\bm k$-linear spin-orbit coupling model. The numerical evaluation is performed for InAs/InSb heterojunction with spin-orbit coupling of both linear and cubic spin-orbit coupling types. For $δ$-type short-range electron-impurity scattering, it is found that the current-induced spin polarization increases with increasing the density when cubic spin-orbit couplings are considered. However, for remote disorders, a rapid enhancement of current-induced spin polarization is always observed at high electron density, even in the case without cubic spin-orbit coupling. This result demonstrates the collision-related feature of current-induced spin polarization. The effects of different high order spin-orbit couplings on spin polarization can be comparable.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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