Two-dimensional topological insulators with large bulk energy gap
Two-dimensional topological insulators with large bulk energy gap
复制标题
具有大体能隙的二维拓扑绝缘体
DOI：
10.1088/1674-1056/25/11/117312
复制
发表时间：
2016
影响因子：
1.7
通讯作者：
Dong Qian
中科院分区：
文献类型：
--
作者：
Z. Q. Yang;Jin-Feng Jia;Dong Qian
二维拓扑绝缘体（TI，Quantum spin Hall insulator）是一类特殊的绝缘体，具有二维电子能隙和一维边缘态的时间反转对称性。处于边缘状态的载流子具有自旋-动量锁定的性质，使得能够沿1D边缘沿着进行无耗散传导。半导体量子阱中的实验证实了二维TI的存在。威尔斯。然而，这些量子威尔斯阱中的2D体隙非常小，极大地限制了在未来电子学和自旋电子学中的潜在应用。尽管存在这种限制，但具有大体积间隙的2D TI吸引了大量兴趣。本文简要回顾了近年来在寻找具有大带隙的TI方面的研究进展。我们首先介绍了这些新材料的一些理论预测，然后讨论了最近在晶体生长和表征方面的一些重要成就。
Two-dimensional (2D) topological insulators (TIs, or quantum spin Hall insulators) are special insulators that possess bulk 2D electronic energy gap and time-reversal symmetry protected one-dimensional (1D) edge state. Carriers in the edge state have the property of spin-momentum locking, enabling dissipation-free conduction along the 1D edge. The existence of 2D TIs was confirmed by experiments in semiconductor quantum wells. However, the 2D bulk gaps in those quantum wells are extremely small, greatly limiting potential application in future electronics and spintronics. Despite this limitation, 2D TIs with a large bulk gap attracted plenty of interest. In this paper, recent progress in searching for TIs with a large bulk gap is reviewed briefly. We start by introducing some theoretical predictions of these new materials and then discuss some recent important achievements in crystal growth and characterization.