Topological phases of a non-Hermitian coupled SSH ladder

作     者：J S Liu Y Z Han C S Liu 刘建森;韩炎桢;刘承师

作者机构：Hebei Key Laboratory of Microstructural Material Physics School of Science Yanshan University 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2019年第28卷第10期

页      面：269-273页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：Project supported by Hebei Provincial Natural Science Foundation of China(Grant Nos.A2012203174 and A2015203387) the National Natural Science Foundation of China(Grant Nos.10974169 and 11304270) 

主　　题：topological phase non-Hermitian Su-Schrieffer-Heeger(SSH) ladder winding number 

摘      要：We study topological phases of a non-Hermitian coupled Su-Schrieffer-Heeger(SSH) ladder. The model originates from the brick-wall lattices in the two-row limit. The Hamiltonian can be brought into block off-diagonal form and the winding number can be defined with the determine of the block off-diagonal matrix. We find the determine of the offdiagonal matrix has nothing to do with the interleg hopping of the ladder. So the topological phases of the model are the same as those of the chains. Further numerical simulations verify the analysis.