Quantum spin Hall effect in a two-orbital model on a honeycomb lattice
Quantum spin Hall effect in a two-orbital model on a honeycomb lattice
复制标题
DOI：
10.1088/1742-6596/592/1/012131
复制
发表时间：
2014-09
期刊：
影响因子：
--
通讯作者：
S. Hayami;H. Kusunose;Y. Motome
中科院分区：
文献类型：
--
作者：
S. Hayami;H. Kusunose;Y. Motome
在蜂窝晶格上的双轨道紧束缚模型中研究了自旋霍尔效应。结果表明，在半填充状态下，该模型呈现出三种不同的绝缘相，这三种绝缘相由不同的自旋霍尔电导率量子化值来区分。我们解析地确定了相界，在那里价带和导带相互接触，在费米能级上形成了狄拉克节点。根据有效的反对称自旋-轨道耦合对结果进行了讨论。文中还讨论了与Kane-Mele模型的关系以及磁电效应的意义。
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.