基于Green函数对角零点计算$\mathbb{Z}_2$拓扑不变量
计算与语言
2025-08-18 v3 人机交互
摘要
我们研究了Green函数的分析性质与拓扑绝缘体之间的关系,聚焦于三维具有 inversion 对称性的系统。我们表明,Green函数在轨道基中的对角零点提供了一种直接且直观的方式来计算强与弱拓扑不变量。我们引入Green函数对角零点在布里渊区交叉处的surface,并表明它将两种轨道能带模型中符号相反的时反不变动量点(TRIMs)分开,从而通过计数两侧的相关TRIMs,实现对不变量的可视化计算。在三能带系统中,类似性仍然成立,除非在非平凡两能带系统的能隙中添加一个平凡能带——这类似于脆弱拓扑绝缘体的能带拓扑结构。
引用
@article{arxiv.2504.00799,
title = {Inaccuracy of an E-Dictionary and Its Influence on Chinese Language Users},
author = {Shiyang Zhang and Fanfei Meng and Xi Wang and Lan Li},
journal= {arXiv preprint arXiv:2504.00799},
year = {2025}
}
备注
The scope of the work has evolved significantly since initial submission, and we are preparing a revised version that better reflects the current direction of the research