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arXiv 1702.08162cond-mat.mes-hall
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具有Rashba自旋轨道相互作用的磁化二维电子气的电流感生自旋极化

Current-induced spin polarization of a magnetized two-dimensional electron gas with Rashba spin-orbit interaction

A. Dyrdal, J. Barnas, V. K. Dugaev

摘要:

本文用松原格林函数理论研究了具有Rashba自旋轨道相互作用的二维电子气中的电流感生自旋极化。这种形式主义允许描述温度依赖性的诱导自旋极化。假设电子气通过交换相互作用耦合到磁性衬底。在线性响应区得到了自旋极化随温度变化的解析和数值结果。自旋极化被表示为两个项的总和-一个与弛豫时间成比例,另一个与磁化Rashba气体的电子能带对应的Berry相相关。本文还讨论了Rashba相互作用引起的自旋-轨道力矩。这种转矩是由于底层的非平衡自旋极化和磁矩之间的交换耦合而产生的。

英文摘要:

Current-induced spin polarization in a two-dimensional electron gas with Rashba spin-orbit interaction is considered theoretically in terms of the Matsubara Green functions. This formalism allows to describe temperature dependence of the induced spin polarization. The electron gas is assumed to be coupled to a magnetic substrate via exchange interaction. Analytical and numerical results on the temperature dependence of spin polarization have been obtained in the linear response regime. The spin polarization has been presented as a sum of two terms - one proportional to the relaxation time and the other related to the Berry phase corresponding to the electronic bands of the magnetized Rashba gas. The spin-orbit torque due to Rashba interaction is also discussed. Such a torque appears as a result of the exchange coupling between the non-equilibrium spin polarization and magnetic moment of the underlayer.

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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