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(School of Physics,Nankai University,Tianjin 300071,China)

机构地区：[1]School of Physics,Nankai University,Tianjin 300071,China

出　　处：《Chinese Physics Letters》2024年第2期83-93,共11页中国物理快报（英文版）

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

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 symmetry.Destructive 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 plaquette.All excitations are completely confined within the localization area,unaffected by gain and loss.Single-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 point.These results provide insights into the fascinating dynamics of non-Hermitian localization,where level coalescence and degeneracy coexist at the exceptional point.

关 键 词：exceptional EXCITATION OSCILLATING 

分 类 号：O411.1[理学—理论物理]