Interaction-induced topological phase transition in the Bernevig-Hughes-Zhang model
Theoretische Physik, ETH Zurich - 8093 Zurich, Switzerland
2 Beijing National Lab for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences Beijing 100190, China
3 International Center for Quantum Materials and School of Physics, Peking University - Beijing 100871, China
Accepted: 8 May 2012
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 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, the present approach is a useful tool for searching for correlated topological insulating materials from the first-principle point of view.
PACS: 73.43.-f – Quantum Hall effects / 03.65.Vf – Phases: geometric; dynamic or topological / 71.70.Ej – Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect
© EPLA, 2012