期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 80, 期 4, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.80.044708
关键词
topological insulator; strongly correlated electron system; spontaneous symmetry breaking; pyrochlore lattice; extended Hubbard model
资金
- Ministry of Education, Culture, Sports, Science and Technology, Japan [22104010, 22340090]
- Grants-in-Aid for Scientific Research [22340090] Funding Source: KAKEN
We study an extended Hubbard model with the nearest-neighbor Coulomb interaction on the pyrochlore lattice at half filling. An interaction-driven insulating phase with nontrivial Z(2) invariants emerges at the Hartree-Fock mean-field level in the phase diagram. This topological insulator phase competes with other ordered states and survives in a parameter region surrounded by a semimetal, antiferromagnetic and charge ordered insulators. The symmetries of these phases are group-theoretically analyzed. We also show that the ferromagnetic interaction enhances the stability of the topological phase.
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