Topological insulators from spontaneous symmetry breaking induced by electron correlation on pyrochlore lattices

Moyuru Kurita, Youhei Yamaji, Masatoshi Imada

研究成果: Article

52 引用 (Scopus)

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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 Z2 invariants emerges at the Hartree-Fock meanfield 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.

元の言語English
記事番号044708
ジャーナルjournal of the physical society of japan
80
発行部数4
DOI
出版物ステータスPublished - 2011 4 1
外部発表Yes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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