Interaction and spin-orbit effects on a kagome lattice at 1/3 filling

doi:10.1088/1674-1056/23/7/077101

中国物理B ›› 2014, Vol. 23 ›› Issue (7): 77101-077101.doi: 10.1088/1674-1056/23/7/077101

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

Interaction and spin-orbit effects on a kagome lattice at 1/3 filling

刘海迪, 陈耀桦, 林恒福, 陶红帅, 武建华

Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

收稿日期:2014-01-20 修回日期:2014-02-19 出版日期:2014-07-15 发布日期:2014-07-15
基金资助:
Project supported by the National Basic Research Program of China (Grant Nos. 2011CB921502 and 2012CB821305) and the National Natural Science Foundation of China (Grant Nos. 61227902, 61378017, and 11311120053).

Interaction and spin-orbit effects on a kagome lattice at 1/3 filling

Liu Hai-Di (刘海迪), Chen Yao-Hua (陈耀桦), Lin Heng-Fu (林恒福), Tao Hong-Shuai (陶红帅), Wu Jian-Hua (武建华)

Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Received:2014-01-20 Revised:2014-02-19 Online:2014-07-15 Published:2014-07-15
Contact: Liu Hai-Di E-mail:hdliu@iphy.ac.cn
About author:71.10.-w; 05.30.Rt; 71.10.Fd
Supported by:
Project supported by the National Basic Research Program of China (Grant Nos. 2011CB921502 and 2012CB821305) and the National Natural Science Foundation of China (Grant Nos. 61227902, 61378017, and 11311120053).

摘要/Abstract

摘要： We investigate the competing effects of spin-orbit coupling and electron-electron interaction on a kagome lattice at 1/3 filling. We apply the cellular dynamical mean-field theory and its real-space extension combined with the continuous time quantum Monte Carlo method, and obtain a phase diagram including the effects of the interaction and the spin-orbit coupling at T=0.1t, where T is the temperature and t is the hopping energy. We find that without the spin-orbit coupling, the system is in a semi-metal phase stable against the electron-electron interaction. The presence of the spin-orbit coupling can induce a topological non-trivial gap and drive the system to a topological insulator, and as the interaction increases, a larger spin-orbit coupling is required to reach the topological insulating phase.

关键词: kagome lattice, spin-orbit coupling, Hubbard interaction

Abstract: We investigate the competing effects of spin-orbit coupling and electron-electron interaction on a kagome lattice at 1/3 filling. We apply the cellular dynamical mean-field theory and its real-space extension combined with the continuous time quantum Monte Carlo method, and obtain a phase diagram including the effects of the interaction and the spin-orbit coupling at T=0.1t, where T is the temperature and t is the hopping energy. We find that without the spin-orbit coupling, the system is in a semi-metal phase stable against the electron-electron interaction. The presence of the spin-orbit coupling can induce a topological non-trivial gap and drive the system to a topological insulator, and as the interaction increases, a larger spin-orbit coupling is required to reach the topological insulating phase.

Key words: kagome lattice, spin-orbit coupling, Hubbard interaction

中图分类号: (Theories and models of many-electron systems)

71.10.-w

05.30.Rt (Quantum phase transitions) 71.10.Fd (Lattice fermion models (Hubbard model, etc.))

刘海迪, 陈耀桦, 林恒福, 陶红帅, 武建华. Interaction and spin-orbit effects on a kagome lattice at 1/3 filling[J]. 中国物理B, 2014, 23(7): 77101-077101.

Liu Hai-Di (刘海迪), Chen Yao-Hua (陈耀桦), Lin Heng-Fu (林恒福), Tao Hong-Shuai (陶红帅), Wu Jian-Hua (武建华). Interaction and spin-orbit effects on a kagome lattice at 1/3 filling[J]. Chin. Phys. B, 2014, 23(7): 77101-077101.

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Interaction and spin-orbit effects on a kagome lattice at 1/3 filling

Interaction and spin-orbit effects on a kagome lattice at 1/3 filling

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