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arXiv 0905.4551cond-mat.mes-hall
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人工势作用下半导体异质结构中自旋霍尔效应的增强

Enhanced spin Hall effect in semiconductor heterostructures with artificial potential

Mikio Eto, Tomohiro Yokoyama

摘要:

我们从理论上研究了半导体异质结构中的非本征自旋霍尔效应(SHE),这是由于由反点、STM针尖等产生的人工电势的散射引起的。首先,我们制定的SHE在分波展开二维电子气的相移。当适当调节吸引势时,共振散射显著增强了这种效应。其次,我们研究了一个三端设备,包括antidot,这可能会产生一个自旋电流的极化超过50%。

英文摘要:

We theoretically investigate an extrinsic spin Hall effect (SHE) in semiconductor heterostructures due to the scattering by an artificial potential created by antidot, STM tip, etc. The potential is electrically tunable. First, we formulate the SHE in terms of phase shifts in the partial wave expansion for two-dimensional electron gas. The effect is significantly enhanced by the resonant scattering when the attractive potential is properly tuned. Second, we examine a three-terminal device including an antidot, which possibly produces a spin current with polarization of more than 50%.

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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