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arXiv 1401.7684cond-mat.mes-hall
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准弹道机制下二维电子和空穴系统的边自旋积累

Edge spin accumulation in 2D electron and hole systems in a quasi-ballistic regime

Alexander Khaetskii

摘要:

我们考虑一个二维结构与自旋轨道相关的分裂的电子(空穴)光谱和计算的边缘自旋密度出现由于自旋轨道相互作用的内在机制中存在的电荷电流通过该结构。我们集中在准弹道的情况下,当一个平均自由程,远小于样本大小,是大于自旋进动长度所确定的值的自旋轨道分裂。我们表明,无论存在或不存在的体自旋电流的边缘自旋密度的主要来源是边界散射本身。边自旋密度的性质取决于体杂质势的光滑性。我们计算了体中散射势任意光滑时的边自旋密度分布,并讨论了与现有二维空穴实验的关系。

英文摘要:

We consider a two-dimensional structure with spin-orbit-related splitting of the electron (hole) spectrum and calculate the edge spin density which appears due to the intrinsic mechanism of spin-orbit interaction in the presence of a charge current through the structure. We concentrate on the quasi-ballistic case when a mean free path, being much smaller than the sample size, is larger than the spin precession length determined by the value of the spin-orbit splitting. We show that regardless of the presence or absence of the bulk spin current the main source of the edge spin density is the boundary scattering itself. The character of the edge spin density depends on the smoothness of the bulk impurity potential. We have calculated the edge spin density profile for an arbitrary smoothness of the scattering potential in the bulk, and discussed relation to the existing experiments for two-dimensional holes.

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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