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arXiv 1409.1202cond-mat.mes-hall
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非均匀二维电子液体中自旋-轨道相互作用引起的自旋-电荷耦合输运理论

Theory of coupled spin-charge transport due to spin-orbit interaction in inhomogeneous two-dimensional electron liquids

K. Shen, R. Raimondi, G. Vignale

摘要:

二维电子液体中的自旋-轨道相互作用导致了许多有趣的输运现象,其中粒子流被转换为自旋极化和自旋流,反之亦然。最好的例子是自旋霍尔效应、埃德尔斯坦效应和它们的逆效应。通过类似的机制,还可以将光学诱导的电子-空穴密度波部分地转换为自旋密度波,反之亦然。在本文中,我们提出了一个统一的理论处理这些影响的基础上的量子动力学方程,其中不仅包括本征的自旋轨道耦合的能带结构的主机材料,但也自旋轨道耦合由于外部电场和随机杂质势。漂移扩散方程,我们推导出的扩散制度适用于各种各样的实验情况下,均匀和非均匀的,并包括在平等的基础上“斜散射”和“侧跳”从电子杂质碰撞。作为一个示范的强度和实用性的理论,我们将其应用到研究的几个效果,目前的实验兴趣:逆Edelstein效应,自旋电流交换效应,和部分转换的电子-空穴密度波的自旋密度波在二维电子气与Rashba和Dresselhaus自旋轨道耦合,受电场。

英文摘要:

Spin-orbit interactions in two-dimensional electron liquids are responsible for many interesting transport phenomena in which particle currents are converted to spin polarizations and spin currents and viceversa. Prime examples are the spin Hall effect, the Edelstein effect, and their inverses. By similar mechanisms it is also possible to partially convert an optically induced electron-hole density wave to a spin density wave and viceversa. In this paper we present a unified theoretical treatment of these effects based on quantum kinetic equations that include not only the intrinsic spin-orbit coupling from the band structure of the host material, but also the spin-orbit coupling due to an external electric field and a random impurity potential. The drift-diffusion equations we derive in the diffusive regime are applicable to a broad variety of experimental situations, both homogeneous and non-homogeneous, and include on equal footing "skew scattering" and "side-jump" from electron-impurity collisions. As a demonstration of the strength and usefulness of the theory we apply it to the study of several effects of current experimental interest: the inverse Edelstein effect, the spin-current swapping effect, and the partial conversion of an electron-hole density wave to a spin density wave in a two-dimensional electron gas with Rashba and Dresselhaus spin-orbit couplings, subject to an electric field.

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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