典型文献
Anomalous Transport Induced by Non-Hermitian Anomalous Berry Connection in Non-Hermitian Systems
文献摘要：
Non-Hermitian materials can exhibit not only exotic energy band structures but also an anomalous velocity in-duced by non-Hermitian anomalous Berry connection as predicted by the semiclassical equations of motion for Bloch electrons.However,it is unclear how the modified semiclassical dynamics modifies transport phenomena.Here,we theoretically demonstrate the emergence of anomalous oscillations driven by either an external dc or ac electric field,which arise from non-Hermitian anomalous Berry connection.Moreover,it is a well-known fact that geometric structures of electric wave functions can only affect the Hall conductivity.However,we are surprised to find a non-Hermitian anomalous Berry connection induced anomalous linear longitudinal conductivity indepen-dent of the scattering time.We also show the emergence of a second-order nonlinear longitudinal conductivity induced by non-Hermitian anomalous Berry connection,violating a well-known fact of its absence in a Hermi-tian system with symmetric energy spectra.These anomalous phenomena are illustrated in a pseudo-Hermitian system with large non-Hermitian anomalous Berry connection.Finally,we propose a practical scheme to realize the anomalous oscillations in an optical system.
文献关键词：
中图分类号：
作者姓名：
Jiong-Hao Wang;Yu-Liang Tao;Yong Xu
作者机构：
Center for Quantum Information,ⅢS,Tsinghua University,Beijing 100084,China;Shanghai Qi Zhi Institute,Shanghai 200030,China
文献出处：
引用格式：
[1]Jiong-Hao Wang;Yu-Liang Tao;Yong Xu-.Anomalous Transport Induced by Non-Hermitian Anomalous Berry Connection in Non-Hermitian Systems)[J].中国物理快报（英文版）,2022(01):1-14
A类：
semiclassical,Hermi,tian
B类：
Anomalous,Transport,Induced,by,Non,Hermitian,Berry,Connection,Systems,materials,can,exhibit,not,only,exotic,energy,band,structures,but,also,anomalous,velocity,connection,predicted,equations,motion,Bloch,electrons,However,unclear,modified,dynamics,modifies,transport,phenomena,Here,theoretically,demonstrate,emergence,oscillations,driven,either,external,dc,electric,field,which,arise,from,Moreover,well,known,fact,that,geometric,wave,functions,affect,Hall,conductivity,are,surprised,find,induced,longitudinal,indepen,dent,scattering,We,show,second,order,nonlinear,violating,its,absence,system,symmetric,spectra,These,illustrated,pseudo,large,Finally,propose,practical,scheme,realize,optical
AB值：
0.493575
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