TY - JOUR
T1 - Topological insulators from spontaneous symmetry breaking induced by electron correlation on pyrochlore lattices
AU - Kurita, Moyuru
AU - Yamaji, Youhei
AU - Imada, Masatoshi
PY - 2011/4
Y1 - 2011/4
N2 - 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.
AB - 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.
KW - Extended hubbard model
KW - Pyrochlore lattice
KW - Spontaneous symmetry breaking
KW - Strongly correlated electron system
KW - Topological insulator
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U2 - 10.1143/JPSJ.80.044708
DO - 10.1143/JPSJ.80.044708
M3 - Article
AN - SCOPUS:79954566337
SN - 0031-9015
VL - 80
JO - journal of the physical society of japan
JF - journal of the physical society of japan
IS - 4
M1 - 044708
ER -