| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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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 |
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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.
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Received: 20 January 2014
Revised: 19 February 2014
Accepted manuscript online:
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PACS:
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71.10.-w
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(Theories and models of many-electron systems)
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05.30.Rt
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(Quantum phase transitions)
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71.10.Fd
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(Lattice fermion models (Hubbard model, etc.))
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| Fund: 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). |
Corresponding Authors:
Liu Hai-Di
E-mail: hdliu@iphy.ac.cn
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| About author: 71.10.-w; 05.30.Rt; 71.10.Fd |
Cite this article:
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 2014 Chin. Phys. B 23 077101
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