Special modes induced by inter-chain coupling in a non-Hermitian ladder system  

作　　者：Rong Huang Yu Yan Zhi-Xu Zhang Lu Qi Hong-Fu Wang Shou Zhang 

机构地区：[1]Department of Physics,College of Science,Yanbian University,Yanji,Jilin 133002,China [2]School of Physics,Harbin Institute of Technology,Harbin,Heilongjiang 150001,China

出　　处：《Communications in Theoretical Physics》2020年第10期53-69,共17页理论物理通讯（英文版）

摘　　要：We explore some interesting phenomena in a simple non-Hermitian ladder system.Special modes with energy eigenvalues closely related to the inter-chain-coupling strength appear in the non-Hermitian ladder system.We show that a phase transition occurs whereby special modes with pure real eigenvalues can switch to special modes with pure imaginary eigenvalues,when the inter-chain-coupling strength changes from symmetric to asymmetric.We find that the density profiles of all the special modes are completely identical under certain conditions,even if the inter-chain-coupling strength is added into the non-Hermitian ladder system in different ways.Moreover,we also demonstrate that the different inter-chain couplings are fundamentally equivalent to adding different on-site potential energies into the non-Hermitian ladder system.

关 键 词：non-Hermitian ladder system special modes inter-chain-coupling 

分 类 号：O411[理学—理论物理]