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

• 作者: Guo-Bao Zhu Hui-Min Yang
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES
• 页码范围: 593-598
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/1674-1056/abdda4

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.