We study interaction induced topological phase transition in Bernevig-Hughes-Zhang model. Topological nature of the phase transition is revealed by directly calculating the Z2 index of the interacting system from the single-particle Green's function. The interacting Z2 index is also consistently checked through the edge spectra. Combined with ab initio methods, present approach is a useful tool searching for correlated topological insulating materials from the first-principle point of view.
@article{arxiv.1203.1124,
title = {Interaction induced topological phase transition in Bernevig-Hughes-Zhang model},
author = {Lei Wang and Xi Dai and X. C. Xie},
journal= {arXiv preprint arXiv:1203.1124},
year = {2012}
}