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arXiv 0707.3580cond-mat.mes-hall
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弹道纳米结中的自旋霍尔效应和自旋轨道耦合

Spin Hall Effect and Spin Orbit coupling in Ballistic Nanojunctions

S. Bellucci, P. Onorato

摘要:

我们提出了一个新的自旋过滤方案的基础上存在的自旋轨道相互作用的纳米交叉,采用弹道纳米结图案化的二维电子气。我们表明,通过一个弹道X结图案化的二维电子气与自旋轨道耦合(SOC)的纵向非极化电流的流动诱导自旋积累,这两个横向探针具有相反的符号。这种自旋积累对应于在结中流动的横向纯自旋电流,是这种纳米结构中自旋霍尔效应的主要可观察特征。我们基准的两种不同类型的自旋轨道相互作用的影响。第一个($α$ -SOC)是由于界面电场将电子限制在二维层中,而第二个($β$ -SOC)对应于由横向限制电势产生的相互作用。

英文摘要:

We propose a new scheme of spin filtering based on nanometric crossjunctions in the presence of Spin Orbit interaction, employing ballistic nanojunctions patterned in a two-dimensional electron gas. We demonstrate that the flow of a longitudinal unpolarized current through a ballistic X junction patterned in a two-dimensional electron gas with Spin Orbit coupling (SOC) induces a spin accumulation which has opposite signs for the two lateral probes. This spin accumulation, corresponding to a transverse pure spin current flowing in the junction, is the main observable signature of the spin Hall effect in such nanostructures. We benchmark the effects of two different kinds of Spin Orbit interactions. The first one ($α$-SOC) is due to the interface electric field that confines electrons to a two-dimensional layer, whereas the second one ($β$-SOC) corresponds to the interaction generated by a lateral confining potential.

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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