Local formula for the Z2 invariant of topological insulators

被引：8
|
作者：
Li, Zhi [1 ]
Mong, Roger S. K.
机构：
[1] Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA
来源：
PHYSICAL REVIEW B | 2019年 / 100卷 / 20期
关键词：
STABLE-HOMOTOPY;
D O I：
10.1103/PhysRevB.100.205101
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We proposed a formula for the Z(2) invariant 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.
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收藏
页数：12
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