Interaction-induced topological phase transition in the Bernevig-Hughes-Zhang model

We study interaction-induced topological phase transition in Bernevig-Hughes-Zhang model. The topological nature of the phase transition is revealed by directly calculating the Z(2) index of the interacting system from the single-particle Green's function. The interacting Z(2) index is also consistently checked through the edge spectra. Combined with ab initio methods, the present approach is a useful tool for searching for correlated topological insulating materials from the first-principle point of view. Copyright (C) EPLA, 2012