Physical Review B 88
, 165132 (2013)
Correlation-driven phase transition in a Chern insulator
Hong-Son Nguyen and Minh-Tien Tran
The phase transition driven by electron correlations in a Chern insulator is investigated within the dynamical
mean-field theory. The Chern insulator is described by the Haldane model and the electron correlations are
incorporated by introducing the short-range interaction between the itinerant electrons and localized fermions.
In the preservation of the inversion symmetry, the electron correlations drive the system from the Chern insulator
to a renormalized pseudogap metal, and then to the topologically trivial Mott insulator. When the inversion
symmetry is broken, a charge ordering and a nontrivial Chern topological invariant coexist.