Topological laser on square lattice with gain–loss-induced higher-order corner modes  

作　　者：廖明杰 韦梅松 王帅领 许静平 羊亚平 Ming-Jie Liao;Mei-Song Wei;Shuailing Wang;Jingping Xu;Yaping Yang(MOE Key Laboratory of Advanced Micro-Structured Materials,School of Physics Science and Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]MOE Key Laboratory of Advanced Micro-Structured Materials,School of Physics Science and Engineering,Tongji University,Shanghai 200092,China

出　　处：《Chinese Physics B》2024年第6期189-195,共7页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 12274326 and 12174288);the National Key R&D Program of China (Grant No. 2021YFA1400602)。

摘　　要：We investigate the higher-order topological laser in the two-dimensional(2D) coupled-cavity array. By adding staggered on-site gain and loss to the 2D Hermitian array with a trivial phase, the system will emerge degenerate topological corner modes, which are protected by bulk band gap. For such a non-Hermitian model, by adjusting the parameters of the system and introducing the pumping into the cavity at the corner, a single-mode lasing with topological protection emerges.Furthermore, single-mode lasing exists over a wide range of pumping strengths. No matter where the cavity is initially stimulated, after enough time evolution, all the cavities belonging to the topological corner mode can emit a stable laser.

关 键 词：topological corner modes nonlinear saturated gain single-mode lasing 

分 类 号：TN248[电子电信—物理电子学] O469[理学—凝聚态物理]