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arXiv 1108.0107cond-mat.mes-hallcond-mat.mtrl-sci
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二维各向异性散射系统中的电子自旋退相

Electron spin dephasing in two-dimensional systems with anisotropic scattering

A. V. Poshakinskiy, S. A. Tarasenko

摘要:

本文发展了具有各向异性电子散射的量子阱中二维电子气自旋弛豫的微观理论。旋进和碰撞为主的自旋动力学制度进行了研究。结果表明,在量子阱与非中心对称散射体,在平面和平面外的自旋分量耦合:自旋移相的载流子最初沿量子阱法线极化导致出现的平面内自旋分量,即使在各向同性自旋轨道分裂的情况下。在碰撞为主的制度,自旋弛豫率张量表示的电导率张量。我们还研究了面内和面外外部磁场对自旋退相的影响,并表明电子自旋的场依赖性可能非常复杂。

英文摘要:

We develop a microscopic theory of spin relaxation of a two-dimensional electron gas in quantum wells with anisotropic electron scattering. Both precessional and collision-dominated regimes of spin dynamics are studied. It is shown that, in quantum wells with noncentrosymmetric scatterers, the in-plane and out-of-plane spin components are coupled: spin dephasing of carriers initially polarized along the quantum well normal leads to the emergence of an in-plane spin component even in the case of isotropic spin-orbit splitting. In the collision-dominated regime, the spin-relaxation-rate tensor is expressed in terms of the electric conductivity tensor. We also study the effect of an in-plane and out-of-plane external magnetic field on spin dephasing and show that the field dependence of electron spin can be very intricate.

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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