Stable two-dimensional dumbbell stanene: A quantum spin Hall insulator
Stable two-dimensional dumbbell stanene: A quantum spin Hall insulator
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DOI：
10.1103/physrevb.90.121408
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发表时间：
2014-07
影响因子：
3.7
通讯作者：
Peizhe Tang;Pengcheng Chen;Wendong Cao;Huaqing Huang;S. Cahangirov;L. Xian;Yong Xu;Shoucheng Zhang-Shoucheng-Zha
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文献类型：
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作者：
Peizhe Tang;Pengcheng Chen;Wendong Cao;Huaqing Huang;S. Cahangirov;L. Xian;Yong Xu;Shoucheng Zhang-Shoucheng-Zha
根据广义梯度近似内的密度泛函理论，我们预测了具有哑铃单元（DB）的锡烯结构，并表明它是一种具有倒带隙的二维拓扑绝缘体，可以通过压缩应变进行调节。此外，我们提出氮化硼片和重建的 $(2\ifmmode\times\else\texttimes\fi{}2)$ InSb(111) 表面是实验实现 DB stanene 的理想基底，保持其非平凡的拓扑结构。结合标准半导体技术，如磁掺杂和电门控，量子反常霍尔效应、陈半金属性和拓扑超导性可以在这些基底上的 DB stanene 中实现。这些特性使二维支撑的锡烯成为研究量子自旋霍尔绝缘体以及其他奇异的物质量子态的良好平台。
From density functional theory within the generalized gradient approximation we predict a structure of stanene with dumbbell units (DBs), and show that it is a two-dimensional topological insulator with an inverted band gap which can be tuned by compressive strain. Furthermore, we propose that the boron nitride sheet and reconstructed $(2\ifmmode\times\else\texttimes\fi{}2)$ InSb(111) surfaces are ideal substrates for the experimental realization of DB stanene, maintaining its nontrivial topology. Combined with standard semiconductor technologies, such as magnetic doping and electrical gating, the quantum anomalous Hall effect, Chern half metallicity, and topological superconductivity can be realized in DB stanene on those substrates. These properties make the two-dimensional supported stanene a good platform for the study of quantum spin Hall insulators as well as other exotic quantum states of matter.