Topological Phase Transitions in the Repulsively Interacting Haldane-Hubbard Model
Research output: Contribution to journal › Article › Scientific › peer-review
- 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.
|Journal||Physical Review Letters|
|Publication status||Published - 2 Jun 2016|
|MoE publication type||A1 Journal article-refereed|