Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-12-03
J. Phys. Soc. Jpn. 80 (2011) 044708
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 5 figures, accepted for publication in J. Phys. Soc. Jpn
Scientific paper
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.
Imada Masatoshi
Kurita Moyuru
Yamaji Youhei
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