Topological Crystalline Insulators
Topological Crystalline Insulators
复制标题
DOI：
10.1103/physrevlett.106.106802
复制
发表时间：
2011-03-08
影响因子：
8.6
通讯作者：
Fu, Liang
中科院分区：
文献类型：
--
作者：
Fu, Liang
最近拓扑绝缘体的发现重新引起了人们对绝缘体带状拓扑结构的兴趣。在这封信中，我们扩展了能带结构的拓扑分类，包括某些晶体点群对称性。我们发现了一类三维拓扑晶体绝缘体，它具有金属表面态，在高对称性晶体表面具有二次带简并。这些拓扑晶体绝缘体是没有自旋轨道耦合的材料中拓扑绝缘体的对应物。它们的能带结构的特点是新的拓扑不变量。我们希望这项工作将扩大家庭的拓扑相带绝缘体和刺激他们在真实的材料的搜索。
The recent discovery of topological insulators has revived interest in the band topology of insulators. In this Letter, we extend the topological classification of band structures to include certain crystal point group symmetry. We find a class of three-dimensional "topological crystalline insulators'' which have metallic surface states with quadratic band degeneracy on high symmetry crystal surfaces. These topological crystalline insulators are the counterpart of topological insulators in materials without spin-orbit coupling. Their band structures are characterized by new topological invariants. We hope this work will enlarge the family of topological phases in band insulators and stimulate the search for them in real materials.