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Chin. Phys. B, 2021, Vol. 30(6): 066701    DOI: 10.1088/1674-1056/abddaa
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES Prev   Next  

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

Weijie Wang(王威杰), Xiaolong Lü(吕小龙), and Hang Xie(谢航)
College of Physics, Chongqing University, Chongqing, China
Abstract  Floquet theorem is widely used in the light-driven systems. But many 2D-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.
Keywords:  Floquet bands      graphene      topological phase transition      edge states  
Received:  14 December 2020      Revised:  14 January 2021      Accepted manuscript online:  20 January 2021
PACS:  67.85.Hj (Bose-Einstein condensates in optical potentials)  
  73.22.Pr (Electronic structure of graphene)  
  73.20.At (Surface states, band structure, electron density of states)  
  78.67.-n (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)  
Fund: Project supported by the starting foundation of Chongqing University (Grant No. 0233001104429), the National Natural Science Foundation of China (Grant No. 11847301), and the Fundamental Research Funds for the Central Universities, China (Grant No. 2020CQJQY-Z003).
Corresponding Authors:  Xiaolong Lu     E-mail:  xiehangphy@cqu.edu.cn

Cite this article: 

Weijie Wang(王威杰), Xiaolong Lü(吕小龙), and Hang Xie(谢航) Floquet bands and photon-induced topological edge states of graphene nanoribbons 2021 Chin. Phys. B 30 066701

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