Topological Invariants of Edge States for Periodic Two-Dimensional Models

被引：0
作者：
Julio Cesar Avila
Hermann Schulz-Baldes
Carlos Villegas-Blas
机构：
[1] Instituto de Matematicas,UNAM
[2] Universität Erlangen-Nürnberg,Department Mathematik
来源：
Mathematical Physics, Analysis and Geometry | 2013年 / 16卷
关键词：
Edge states; Bloch theory; Topological invariants; 81V70; 19L10; 82B20;
D O I：
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中图分类号：
学科分类号：
摘要：
Transfer matrix methods and intersection theory are used to calculate the bands of edge states for a wide class of periodic two-dimensional tight-binding models including a sublattice and spin degree of freedom. This allows to define topological invariants by considering the associated Bott–Maslov indices which can be easily calculated numerically. For time-reversal symmetric systems in the symplectic universality class this leads to a \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}${\mathbb Z}_2$\end{document}-invariant for the edge states. It is shown that the edge state invariants are related to Chern numbers of the bulk systems and also to (spin) edge currents, in the spirit of the theory of topological insulators.
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页码：137 / 170
页数：33
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