Topological Phase Transitions in the Repulsively Interacting Haldane-Hubbard Model

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Research units

  • Swiss Federal Institute of Technology Zurich
  • Institute for Quantum Electronics


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.


Original languageEnglish
Article number225305
Pages (from-to)1-6
JournalPhysical Review Letters
Issue number22
Publication statusPublished - 2 Jun 2016
MoE publication typeA1 Journal article-refereed

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