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arXiv 1712.03386cond-mat.mes-hall
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Rashba环中热自旋电流的光致可调谐性

Photon-induced tunability of the thermospin current in a Rashba ring

Nzar Rauf Abdullah, Thorsten Arnold, Chi-Shung Tang, Andrei Manolescu, Vidar Gudmundsson

摘要:

这项工作的目标是显示如何在量子环的热自旋极化电流的变化存在的Rashba自旋轨道耦合和一个量子化的单光子模式的腔环被放置在。采用约化密度算符和一般的主方程形式,我们发现,Rashba相互作用和光子场可以显着调制的自旋极化和热自旋极化电流。通过调节Rashba耦合常数,在量子环系统中形成了对应于Aharonov-Casher相消干涉的简并能级。我们的分析表明,在没有光子场的系统中,由于自旋积累,在简并能级处可以观察到最大自旋极化。热自旋电流因此被抑制。在腔的存在下,光子场导致电子的附加动量,从而增强了自旋极化。

英文摘要:

The goal of this work is to show how the thermospin polarization current in a quantum ring changes in the presence of Rashba spin-orbit coupling and a quantized single photon mode of a cavity the ring is placed in. Employing the reduced density operator and a general master equation formalism, we find that both the Rashba interaction and the photon field can significantly modulate the spin polarization and the thermospin polarization current. Tuning the Rashba coupling constant, degenerate energy levels are formed corresponding to the Aharonov-Casher destructive phase interference in the quantum ring system. Our analysis indicates that the maximum spin polarization can be observed at the points of degenerate energy levels due to spin accumulation in the system without the photon field. The thermospin current is thus suppressed. In the presence of the cavity, the photon field leads to an additional kinetic momentum of the electron. As a result the spin polarization can be enhanced by the photon 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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