Topological Phase Transitions in the Repulsively Interacting Haldane-Hubbard Model

Using dynamical mean-field theory and exact diagonalization we study the phase diagram of the repulsive Haldane-Hubbard model, varying the interaction strength and the sublattice potential difference. In addition to the quantum Hall phase with Chern number C=2 and the band insulator with C=0 present...

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Published inPhysical review letters Vol. 116; no. 22; p. 225305
Main Authors Vanhala, Tuomas I, Siro, Topi, Liang, Long, Troyer, Matthias, Harju, Ari, Törmä, Päivi
Format Journal Article
LanguageEnglish
Published United States 03.06.2016
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Summary:Using dynamical mean-field theory and exact diagonalization we study the phase diagram of the repulsive Haldane-Hubbard model, varying the interaction strength and the sublattice potential difference. In addition to the quantum Hall phase with Chern number C=2 and the band insulator with C=0 present already in the noninteracting model, the system also exhibits a C=0 Mott insulating phase, and a C=1 quantum Hall phase. We explain the latter phase by a spontaneous symmetry breaking where one of the spin components is in the Hall state and the other in the band insulating state.
ISSN:1079-7114
DOI:10.1103/physrevlett.116.225305