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arXiv 1409.2142cond-mat.str-el
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蜂窝晶格双轨道模型中的量子自旋霍尔效应

Quantum spin Hall effect in a two-orbital model on a honeycomb lattice

Satoru Hayami, Hiroaki Kusunose, Yukitoshi Motome

摘要:

在双轨道紧束缚模型中研究了蜂窝晶格上的自旋霍尔效应。我们表明,该模型表现出三个拓扑不同的绝缘相在半填充,这是由不同的量子化值的自旋霍尔电导率区分。我们分析确定的相界,在那里的价带和导带接触,形成狄拉克节点在费米能级。结果进行了讨论的有效反对称自旋轨道耦合。的凯恩-梅勒模型和影响的磁电效应的关系进行了讨论。

英文摘要:

The spin Hall effect is investigated in a two-orbital tight-binding model on a honeycomb lattice. We show that the model exhibits three topologically-different insulating phases at half filling, which are distinguished by different quantized values of the spin Hall conductivity. We analytically determine the phase boundaries, where the valence and conduction bands touch with each other with forming the Dirac nodes at the Fermi level. The results are discussed in terms of the effective antisymmetric spin-orbit coupling. The relation to the Kane-Mele model and implications for a magnetoelectric effect are also discussed.

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