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arXiv 0901.1367cond-mat.mes-hallcond-mat.str-el
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四端量子点环中Rashba诱导的横向纯自旋流

Rashba-induced transverse pure spin currents in a four-terminal quantum dot ring

Weijiang Gong, Yu Han, Guozhu Wei, Yisong Zheng

摘要:

通过在四端四量子点环的单个量子点上施加局域Rashba自旋轨道相互作用,并在纵向端之间引入有限偏压,我们从理论上研究了横向端中的电荷流和自旋流.结果表明,当量子点能级与横向终端的化学势分离时,在横向终端出现了幅度相同、极化方向相反的纯自旋电流.此外,通过改变结构参数,可以反转这种纯自旋电流的极化方向,即,磁通量、偏置电压和相对于横向端子的化学势的量子点能级的值。

英文摘要:

By applying a local Rashba spin-orbit interaction on an individual quantum dot of a four-terminal four-quantum-dot ring and introducing a finite bias between the longitudinal terminals, we theoretically investigate the charge and spin currents in the transverse terminals. It is found that when the quantum dot levels are separate from the chemical potentials of the transverse terminals, notable pure spin currents appear in the transverse terminals with the same amplitude and opposite polarization directions. Besides, the polarization directions of such pure spin currents can be inverted by altering structure parameters, i.e., the magnetic flux, the bias voltage, and the values of quantum dot levels with respect to the chemical potentials of the transverse terminals.

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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