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arXiv 1002.0050cond-mat.mes-hall
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四端量子点环中自旋偏置的探测

Detection of spin bias in four-terminal quantum-dot ring

Weijiang Gong, Hui Li, Sha Zhang, Yu Han, Guozhu Wei

摘要:

在这项工作中,我们表明,在一个四量子点环,通过引入一个本地Rashba自旋轨道相互作用的自旋偏置的横向终端可以通过观察在纵向探针的电荷电流检测。研究发现,由于Rashba相互作用,该系统中的量子干涉变得与自旋相关,自旋偏置引起的反自旋电流可以呈现不同的大小,从而产生电荷电流.此外,电荷流依赖于自旋偏置的大小和自旋极化方向。据信,这种方法提供了一种电的但实用的方案来检测自旋偏置(或自旋电流)。

英文摘要:

In this work, we show that in a four-quantum-dot ring, via introducing a local Rashba spin-orbit interaction the spin bias in the transverse terminals can be detected by observing the charge currents in the longitudinal probes. It is found that due to the Rashba interaction, the quantum interference in this system becomes spin-dependent and the opposite-spin currents induced by the spin bias can present different magnitudes, so charge currents emerge. Besides, the charge currents rely on both the magnitude and spin polarization direction of the spin bias. It is believed that this method provides an electrical but practical scheme to detect the spin bias (or the spin current).

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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