Localization Dynamics at the Exceptional Point of Non-Hermitian Creutz Ladder

作     者：张舒迈 何天毅 金亮 S.M.Zhang;T.Y.He;L.Jin

作者机构：School of PhysicsNankai UniversityTianjin 300071China 

出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)

年 卷 期：2024年第41卷第2期

页      面：83-93页

核心收录：

学科分类：07[理学] 070104[理学-应用数学] 0701[理学-数学] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12222504 and 11975128) 

主　　题：exceptional excitation oscillating 

摘      要：We propose a quasi-one-dimensional non-Hermitian Creutz ladder with an entirely flat spectrum by introducing alternating gain and loss components while maintaining inversion *** interference generates a flat spectrum at the exceptional point,where the Creutz ladder maintains coalesced and degenerate eigenvalues with compact localized states distributed in a single *** excitations are completely confined within the localization area,unaffected by gain and ***-site excitations exhibit nonunitary dynamics with intensities increasing due to level coalescence,while multiple-site excitations may display oscillating or constant intensities at the exceptional *** results provide insights into the fascinating dynamics of non-Hermitian localization,where level coalescence and degeneracy coexist at the exceptional point.