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

机译:普通二维电子系统的电流感应自旋极化

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摘要

In this paper, current-induced spin polarization (CISP) fora two-dimensional electron gas with a general spin–orbitinteraction is investigated. For an isotropic energy spectrum,the in-plane CISP is found to be dependent on the electrondensity for a non-linear spin–orbit interaction and increaseswith the increment of sheet density, in contrast to the casefor the k-linear spin–orbit coupling model. The numericalevaluation is performed for an InAs/InSb heterojunction withspin–orbit coupling of both linear and cubic spin–orbit coupling types. For δ-type short-range electron-impurity scattering, it isfound that the CISP increases with increasing density whencubic spin–orbit couplings are considered. However, for remotedisorders, a rapid enhancement of CISP is always observed athigh electron density, even in the case without cubic spin–orbitcoupling. This result demonstrates the collision-related featureof CISP. The effects of different high-order spin–orbit couplingson spin polarization can be comparable.
机译:在本文中,研究了具有自旋-轨道相互作用的二维电子气的电流感应自旋极化(CISP)。对于各向同性的能谱,与k线性自旋轨道耦合模型的情况相反,发现面内CISP依赖于非线性自旋轨道相互作用的电子密度,并随板密度的增加而增加。 。对具有线性和立方自旋轨道耦合类型的自旋轨道耦合的InAs / InSb异质结进行了数值评估。对于δ型短程电子杂质散射,发现当考虑三次自旋-轨道耦合时,CISP随着密度的增加而增加。但是,对于远程疾病,即使没有立方自旋-轨道耦合,也总是在高电子密度下观察到CISP的快速增强。该结果证明了CISP与碰撞有关的功能。自旋极化的不同高阶自旋-轨道耦合的影响可以比较。

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