We investigate quantum phase transitions in the extended periodic Anderson model, which includes electron correlations within and between itinerant and localized bands. We calculate zero and finite temperature properties of the system using the combination of dynamical mean-field theory and the numerical renormalization group. At half filling, a phase transition between a Mott insulating state and a Kondo insulating state occurs in the strong coupling regime. We furthermore find that a metallic state is stabilized in the weak coupling regime. This state should be adiabatically connected to the orbital selective Mott state with one orbital localized and the other itinerant. The effect of hole doping is also addressed.
@article{arxiv.0708.1765,
title = {Quantum phase transitions in the extended periodic Anderson model},
author = {Akihisa Koga and Norio Kawakami and Robert Peters and Thomas Pruschke},
journal= {arXiv preprint arXiv:0708.1765},
year = {2009}
}