Local formula for the Z2 invariant of topological insulators
Local formula for the Z2 invariant of topological insulators
复制标题
拓扑绝缘体 Z2 不变量的局部公式
DOI:
10.1103/physrevb.100.205101
复制
发表时间:
2019
影响因子:
3.7
通讯作者:
Mong, Roger S.
中科院分区:
文献类型:
--
作者:
Li, Zhi;Mong, Roger S.
We proposed a formula for theinvariant for topological insulators, which remains valid without translational invariance. Our formula is a local expression, in the sense that the contributions mainly come from quantities near a point. Using almost commute matrices, we proposed a method to approximate this invariant with local information. The validity of the formula and the approximation method is proved.