Pseudospin-induced asymmetric field in non-Hermitian photonic crystals with multiple topological transitions

作     者：Yuchen Peng Aoqian Shi Peng Peng Jianjun Liu 

作者机构：Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education & Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and Electronics Hunan University Changsha 410082 China Greater Bay Area Institute for Innovation Hunan University Guangzhou 511300 China 

出 版 物：《Physical Review B》 (Phys. Rev. B)

年 卷 期：2025年第111卷第8期

页      面：085148-085148页

核心收录：

基　　金：State Key Laboratory of Advanced Optical Communication Systems and Networks, LOCT, (2024GZKF20) State Key Laboratory of Advanced Optical Communication Systems and Networks, LOCT Natural Science Foundation of Hunan Province, (2017JJ2048, 2020JJ4161) Natural Science Foundation of Hunan Province Scientific Research Foundation of Hunan Provincial Education Department, (21A0013) Scientific Research Foundation of Hunan Provincial Education Department Basic and Applied Basic Research Foundation of Guangdong Province, (2024A1515011353) Basic and Applied Basic Research Foundation of Guangdong Province National Natural Science Foundation of China, NSFC, (61405058, 62075059) National Natural Science Foundation of China, NSFC 

主　　题：Spin Hall effect 

摘      要：We report the discovery of multiple topological phase transitions induced by the photonic quantum spin Hall effect (PQSHE) in a non-Hermitian photonic crystal (PhC). When increasing the magnitude of the non-Hermitian terms, the system undergoes transitions from topological corner states to topological edge states and subsequently to topological bulk states. The angular momentum of the wave function of the out-of-plane electric field excited by the chiral source acts as the pseudospin degree of freedom in the PQSHE. Therefore, we consider the introduction of chiral sources with different circular polarizations into non-Hermitian PhCs and observe the emergence of asymmetric field responses. These results are expected to enable the multidimensional manipulation of topological states, offering an avenue for the detection of chiral sources.