Observing non-Hermiticity induced chirality breaking in a synthetic Hall ladder  

作　　者：Rui Ye Yanyan He Guangzhen Li Luojia Wang Xiaoxiong Wu Xin Qiao Yuanlin Zheng Liang Jin Da-Wei Wang Luqi Yuan Xianfeng Chen 

机构地区：[1]State Key Laboratory of Advanced Optical Communication Systems and Networks,School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai,200240,China [2]School of Physics,Nankai University,Tianjin,300071,China [3]Zhejiang Key Laboratory of Micro-Nano Quantum Chips and Quantum Control,School of Physics,and State Key Laboratory for Extreme Photonics and Instrumentation,Zhejiang University,Hangzhou,310027,China [4]Shanghai Research Center for Quantum Sciences,Shanghai,201315,China [5]Collaborative Innovation Center of Light Manipulations and Applications,Shandong Normal University,Jinan,250358,China

出　　处：《Light(Science & Applications)》2025年第1期280-290,共11页光(科学与应用)(英文版)

基　　金：supported by National Key R&D Program of China(No.2023YFA1407200 and No.2021YFA1400900);National Natural Science Foundation of China(12122407,12104297,12192252,11974245,and 12204304);China Postdoctoral Science Foundation(2023M742292,GZC20231614).

摘　　要：Non-Hermitian topological photonics plays a key role in bridging topological matter with gain and loss engineering in optics.Here we report the experimental observation of the break of chiral currents in a Hall ladder from the non-Hermiticity by constructing synthetic frequency dimension in two rings,where currents on both legs of the ladder co-propagate in the same direction.The origin of such phenomena is resulted from the interplay between the effective magnetic flux and the on-site gain and loss.Such non-Hermitian co-propagating currents exhibit characteristics of unidirectional frequency conversion in both rings,and moreover,different from the counterpart in Hermitian systems,can provide a method to probe the signatures of the non-Hermitian skin effect from steady-state bulk dynamics.Our model is further extended to models including next-nearest-neighbor couplings,pointing to a way for observing the non-Hermitian signature with higher winding number,and provides a new control knob for light manipulation with the topological dissipation engineering.

关 键 词：LADDER TOPOLOGICAL signature 

分 类 号：O469[理学—凝聚态物理]