Floquet bands and photon-induced topological edge states of graphene nanoribbons  

作　　者：Weijie Wang Xiaolong Lü Hang Xie 王威杰;吕小龙;谢航(College of Physics,Chongqing University,Chongqing,China)

机构地区：[1]College of Physics,Chongqing University,Chongqing,China

出　　处：《Chinese Physics B》2021年第6期449-456,共8页中国物理B（英文版）

基　　金：supported by the starting foundation of Chongqing University (Grant No. 0233001104429);the National Natural Science Foundation of China (Grant No. 11847301);the Fundamental Research Funds for the Central Universities,China (Grant No. 2020CQJQY-Z003)。

摘　　要：Floquet theorem is widely used in the light-driven systems. But many 2 D-materials models under the radiation are investigated with the high-frequency approximation, which may not be suitable for the practical experiment. In this work,we employ the non-perturbative Floquet method to strictly investigate the photo-induced topological phase transitions and edge states properties of graphene nanoribbons under the light irradiation of different frequencies(including both low and high frequencies). By analyzing the Floquet energy bands of ribbon and bulk graphene, we find the cause of the phase transitions and its relation with edge states. Besides, we also find the size effect of the graphene nanoribbon on the band gap and edge states in the presence of the light.

关 键 词：Floquet bands GRAPHENE topological phase transition edge states 

分 类 号：TQ127.11[化学工程—无机化工] TB383.1[一般工业技术—材料科学与工程] O469[理学—凝聚态物理]