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arXiv 1402.4347cond-mat.mes-hall
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Dirac材料中自旋轨道耦合在拓扑保护界面态中的作用

The role of spin-orbit coupling in topologically protected interface states in Dirac materials

D. S. L. Abergel, Jonathan M. Edge, Alexander V. Balatsky

摘要:

我们强调的事实是,二维材料的狄拉克类低能量能带结构和自旋轨道耦合将产生线性分散拓扑保护Jackiw-Rebbi模式的界面处的狄拉克质量变化的迹象。这些模式可以支持平行于界面的持续自旋或谷电流,并且这种拓扑保护电流的确切布置关键地取决于材料中的自旋轨道耦合的细节。作为例子,我们讨论了屈曲的二维六方晶格,如硅烯或锗烯,和过渡金属二硫属化物,如MoS $_2$。

英文摘要:

We highlight the fact that two-dimensional materials with Dirac-like low energy band structures and spin-orbit coupling will produce linearly dispersing topologically protected Jackiw-Rebbi modes at interfaces where the Dirac mass changes sign. These modes may support persistent spin or valley currents parallel to the interface, and the exact arrangement of such topologically protected currents depends crucially on the details of the spin-orbit coupling in the material. As examples, we discuss buckled two-dimensional hexagonal lattices such as silicene or germanene, and transition metal dichalcogenides such as MoS$_2$.

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