Floquet topological phase transition in two-dimensional quadratic band crossing system  

作　　者：Guo-Bao Zhu Hui-Min Yang 朱国宝;杨慧敏(School of Physics and Electronic Engineering,Heze University,Heze 274015,China)

机构地区：[1]School of Physics and Electronic Engineering,Heze University,Heze 274015,China

出　　处：《Chinese Physics B》2021年第6期521-525,共5页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 11504095)。

摘　　要：We investigate the Hall effects of quadratic band crossing(QBC) fermions in a square optical lattice with spin–orbit coupling and orbital Zeeman term. We find that the orbital Zeeman term and shaking play critical roles in the systems,which can drive a topological transition from spin Hall phases to anomalous Hall phase with nonvanishing(spin) Chern numbers. Due to the interplay among the orbital Zeeman term, spin–orbit coupling, and the shaking, the phase diagram of the system exhibits rich phases, which are characterized by Chern number.

关 键 词：SHAKING quadratic band crossing ORBITAL 

分 类 号：O469[理学—凝聚态物理]