Topological phase transition based on the attractive Hubbard model

  title={Topological phase transition based on the attractive Hubbard model},
  author={Fenghua Qi and Jun Cao and Jie Cao and Xiao Li and Lifa Zhang},
  journal={EPL (Europhysics Letters)},
We theoretically investigate the effect of an attractive on-site interaction on the two-band magnetic Dirac fermion model based on a square lattice system. When the attractive fermion interaction is taken into account by the mean-field approximation, a phase diagram is obtained. It is found that a quantum phase transition from a band insulator state to quantum anomalous Hall state occurs with increased attractive interaction. For an existing quantum anomalous Hall state, the attractive… Expand

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