中国物理B ›› 2017, Vol. 26 ›› Issue (1): 17102-017102.doi: 10.1088/1674-1056/26/1/017102

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Control of topological phase transitions in Dirac semimetal films by exchange fields

Fei Yang(杨菲), Hai-Long Wang(王海龙), Hui Pan(潘晖)   

  1. Department of Physics, Beihang University, Beijing 100191, China
  • 收稿日期:2016-07-05 修回日期:2016-10-22 出版日期:2017-01-05 发布日期:2017-01-05
  • 通讯作者: Hai-Long Wang, Hui Pan E-mail:hlwang@buaa.edu.cn;hpan@buaa.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant No. 11574019).

Control of topological phase transitions in Dirac semimetal films by exchange fields

Fei Yang(杨菲), Hai-Long Wang(王海龙), Hui Pan(潘晖)   

  1. Department of Physics, Beihang University, Beijing 100191, China
  • Received:2016-07-05 Revised:2016-10-22 Online:2017-01-05 Published:2017-01-05
  • Contact: Hai-Long Wang, Hui Pan E-mail:hlwang@buaa.edu.cn;hpan@buaa.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant No. 11574019).

摘要:

The exchange field effects on topological Dirac semimetal (DSM) films are discussed in this article. A topological phase transition can be controlled by tuning the exchange field together with the quantum confinement effects. What is more interesting is that the system can transit into the quantum anomalous Hall (QAH) state from the topologically trivial state (Z2=0) or from the topologically nontrivial state (Z2=1), depending on the thickness of the DSM films. This provides a useful mechanism to realize the QAH state from the DSM.

关键词: exchange field, Dirac semimetal, quantum anomalous Hall state, quantum spin Hall state

Abstract:

The exchange field effects on topological Dirac semimetal (DSM) films are discussed in this article. A topological phase transition can be controlled by tuning the exchange field together with the quantum confinement effects. What is more interesting is that the system can transit into the quantum anomalous Hall (QAH) state from the topologically trivial state (Z2=0) or from the topologically nontrivial state (Z2=1), depending on the thickness of the DSM films. This provides a useful mechanism to realize the QAH state from the DSM.

Key words: exchange field, Dirac semimetal, quantum anomalous Hall state, quantum spin Hall state

中图分类号:  (Electron density of states and band structure of crystalline solids)

  • 71.20.-b
73.20.At (Surface states, band structure, electron density of states) 73.22.Gk (Broken symmetry phases) 73.43.Nq (Quantum phase transitions)