Floquet spectrum and optical behaviors in dynamic Su–Schrieffer–Heeger modeled waveguide array  

作　　者：Ye Yu Yiwen Song Tao Chen Huaiqiang Wang Songlin Zhuang Qingqing Cheng 余晔;宋一雯;陈焘;王怀强;庄松林;程庆庆(School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;National Laboratory of Solid State Microstructures,School of Physics,Nanjing University,Nanjing 210093,China)

机构地区：[1]School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China [2]National Laboratory of Solid State Microstructures,School of Physics,Nanjing University,Nanjing 210093,China

出　　处：《Chinese Optics Letters》2021年第4期71-76,共6页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 11874266 and 11604208);the Shanghai Science and Technology Committee (Nos. 16ZR1445600 and 16ZR1445500);the ChenGuang Program (No. 17CG49)。

摘　　要：Floquet topological insulators(FTIs) have been used to study the topological features of a dynamic quantum system within the band structure. However, it is difficult to directly observe the dynamic modulation of band structures in FTIs. Here, we implement the dynamic Su–Schrieffer–Heeger model in periodically curved waveguides to explore new behaviors in FTIs using light field evolutions. Changing the driving frequency produces near-field evolutions of light in the high-frequency curved waveguide array that are equivalent to the behaviors in straight arrays. Furthermore, at modest driving frequencies,the field evolutions in the system show boundary propagation, which are related to topological edge modes. Finally, we believe curved waveguides enable profound possibilities for the further development of Floquet engineering in periodically driven systems, which ranges from condensed matter physics to photonics.

关 键 词：topological photonics insulator waveguide array FLOQUET 

分 类 号：O469[理学—凝聚态物理]