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arXiv 0707.4571cond-mat.mes-hall
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二维电子气中的光子辅助自旋输运

Photon-assisted spin transport in a two-dimensional electron gas

M. V. Fistul, K. B. Efetov

摘要:

本文研究了外加阶梯势$V(x)$的二维电子气在电磁场照射下的自旋相关输运。在没有EF的情况下,电子光谱分裂成源自“Rashba”自旋轨道耦合的自旋子带。我们发现,传播电子的共振相互作用与组件EF平行的障碍诱导\textit{% non-equilibrium dynamic gap} $(2Δ_{R})$之间的自旋子带。这个能隙的存在导致相干自旋翻转过程,导致自旋极化电流和大的磁电阻,即自旋阀效应。这些效应可用于控制半导体纳米结构(例如自旋晶体管、自旋阻断器件等)中的自旋输运,通过改变外部辐射的强度S和频率$ω$。

英文摘要:

We study spin-dependent transport in a two-dimensional electron gas subject to an external step-like potential $V(x)$ and irradiated by an electromagnetic field (EF). In the absence of EF the electronic spectrum splits into spin sub-bands originating from the "Rashba" spin-orbit coupling. We show that the resonant interaction of propagating electrons with the component EF parallel to the barrier induces a \textit{% non-equilibrium dynamic gap} $(2Δ_{R})$ between the spin sub-bands. Existence of this gap results in coherent spin-flip processes that lead to a spin-polarized current and a large magnetoresistance, i.e the spin valve effect. These effects may be used for controlling spin transport in semiconducting nanostructures, e.g. spin transistors, spin-blockade devices etc., by variation of the intensity S and frequency $ω$ of the external radiation.

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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