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arXiv 1008.4656cond-mat.mes-hallnlin.CD
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自旋输运中的几何关联与介观普适性破缺

Geometric Correlations and Breakdown of Mesoscopic Universality in Spin Transport

I. Adagideli, Ph. Jacquod, M. Scheid, M. Duckheim, D. Loss, K. Richter

摘要:

本文建立了具有自旋-轨道相互作用的混沌弹道和无序扩散介观系统中电荷和自旋输运的统一半经典理论。忽略自旋轨道相互作用的动力学效应,我们再现了随机矩阵理论的结果,即自旋电导普遍地在零平均附近波动。在理论中阐明这些效应,我们表明,几何关联产生有限的平均自旋电导,但它们不影响电荷电导的领先秩序。该理论,这是通过数值计算的输运证实,使我们能够调查整个范围从弱到以前未探索的强自旋轨道制度,自旋旋转时间短于动量弛豫时间。

英文摘要:

We construct a unified semiclassical theory of charge and spin transport in chaotic ballistic and disordered diffusive mesoscopic systems with spin-orbit interaction. Neglecting dynamic effects of spin-orbit interaction, we reproduce the random matrix theory results that the spin conductance fluctuates universally around zero average. Incorporating these effects in the theory, we show that geometric correlations generate finite average spin conductances, but that they do not affect the charge conductance to leading order. The theory, which is confirmed by numerical transport calculations, allows us to investigate the entire range from the weak to the previously unexplored strong spin-orbit regime, where the spin rotation time is shorter than the momentum relaxation time.

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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