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arXiv 0907.2411cond-mat.mes-hall
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蜂窝晶格中的直立Rashba自旋:电可逆表面自旋极化

Upstanding Rashba spin in honeycomb lattices: Electrically reversible surface spin polarization

Ming-Hao Liu, Ching-Ray Chang

摘要:

二维系统中Rashba自旋-轨道耦合的自旋分裂态一直被认为指向平面内并垂直于相应的波矢。这对于自由电子模型一般来说是正确的,但在其他地方确实存在例外。在紧束缚模型中,我们揭示了蜂窝晶格中围绕$\bar{K}$和$\bar{K}^{\prime}$点的Rashba自旋的不寻常的直立行为。我们的计算(i)解释了最近的Tl/Si(111)- $(1\times1)$表面合金的实验[Phys.Rev.Lett. \textbf{102},096805(2009)],其中观察到$\bar{K}$附近的突然直立自旋态,以及(ii)预测电可逆的面外表面自旋极化。

英文摘要:

The spin-split states subject to Rashba spin-orbit coupling in two-dimensional systems have long been accepted as pointing inplane and perpendicular to the corresponding wave vectors. This is in general true for free electron model, but exceptions do exist elsewhere. Within the tight-binding model, we unveil the unusual upstanding behavior of those Rashba spins around $\bar{K}$ and $\bar{K}^{\prime}$ points in honeycomb lattices. Our calculation (i) explains the recent experiment of the Tl/Si(111)-$(1\times1)$ surface alloy [Phys. Rev. Lett. \textbf{102}, 096805 (2009)], where abrupt upstanding spin states near $\bar{K}$ are observed, and (ii) predicts an electrically reversible out-of-plane surface spin polarization.

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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