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

Moyuru Kurita, Youhei Yamaji, Masatoshi Imada

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51 Citations (Scopus)


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.

Original languageEnglish
Article number044708
JournalJournal of the Physical Society of Japan
Issue number4
Publication statusPublished - 2011 Apr 1
Externally publishedYes



  • Extended hubbard model
  • Pyrochlore lattice
  • Spontaneous symmetry breaking
  • Strongly correlated electron system
  • Topological insulator

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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