Fluctuation-induced topological quantum phase transitions in quantum spin-Hall and anomalous-Hall insulators
Fluctuation-induced topological quantum phase transitions in quantum spin-Hall and anomalous-Hall insulators
We investigate the role of quantum fluctuations in topological quantum phase transitions of quantum spin-Hall insulators and quantum anomalous-Hall insulators. Employing the variational cluster approximation to obtain the single-particle Green's function of the interacting many-body system, we characterize different phases by direct calculation of the recently proposed topological order parameter …