中国物理B ›› 2021, Vol. 30 ›› Issue (6): 67304-067304.doi: 10.1088/1674-1056/abdda4

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

Guo-Bao Zhu(朱国宝) and Hui-Min Yang(杨慧敏)   

  1. School of Physics and Electronic Engineering, Heze University, Heze 274015, China
  • 收稿日期:2020-11-02 修回日期:2021-01-11 接受日期:2021-01-20 出版日期:2021-05-18 发布日期:2021-06-05
  • 通讯作者: Hui-Min Yang E-mail:yangyhm@163.com
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 11504095).

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

Guo-Bao Zhu(朱国宝) and Hui-Min Yang(杨慧敏)   

  1. School of Physics and Electronic Engineering, Heze University, Heze 274015, China
  • Received:2020-11-02 Revised:2021-01-11 Accepted:2021-01-20 Online:2021-05-18 Published:2021-06-05
  • Contact: Hui-Min Yang E-mail:yangyhm@163.com
  • Supported by:
    Project 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

Abstract: 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.

Key words: shaking, quadratic band crossing, orbital

中图分类号:  (Quantum phase transitions)

  • 73.43.Nq
37.10.Jk (Atoms in optical lattices) 71.10.Fd (Lattice fermion models (Hubbard model, etc.))