Topological Insulators from Spontaneous Symmetry Breaking Induced by Electron Correlation on Pyrochlore Lattices
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概要
- 論文の詳細を見る
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.
- Physical Society of Japanの論文
- 2011-04-15
著者
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Imada Masatoshi
Department Of Applied Physics University Of Tokyo
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Yamaji Youhei
Department Of Applied Physics University Of Tokyo
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Kurita Moyuru
Department of Applied Physics, University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
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