中文

绕数与陈数之间的联系

介观与纳米尺度物理 2021-01-01 v2

摘要

体-边对应是拓扑绝缘体最显著的性质之一。特别地,一维绕数 \n\n 与具有边界的拓扑绝缘体链中边缘态数目一一对应。通过适当选取原胞,我们进行数值计算,在扩展 SSH 模型中明确显示:对应于左右原胞的绕数可用于预测有限链中两个边界上的边缘态数目。此外,通过类比 SSH 模型与 QWZ 模型,我们表明扩展 SSH 模型可推广至扩展 QWZ 模型。通过在布里渊区中动量条带 0p2π,0p12π0\le p_2 \le \pi, 0\le p_1 2\pi 上积分“磁场”,我们展示了一个关联二维陈数与 p2=0p_2=0p2=πp_2 =\pi 处一维绕数之差的恒等式。

关键词

引用

@article{arxiv.1908.06700,
  title  = {Connection between the winding number and the Chern number},
  author = {Han-Ting Chen and Chia-Hsun Chang and Hsien-chung Kao},
  journal= {arXiv preprint arXiv:1908.06700},
  year   = {2021}
}

备注

13 pages, 39 figures, Major revision. Connection between the winding number and the Chern number has been shown. The part related to the modification of the Zak phase has been deleted since there may be some errors