Quantum phase transitions in the extended periodic Anderson model

TL;DR

This paper studies quantum phase transitions in an extended periodic Anderson model, revealing a transition between Mott and Kondo insulators, and the stabilization of a metallic state at weak coupling, using advanced theoretical methods.

Contribution

It introduces a detailed analysis of phase transitions in the extended periodic Anderson model, including effects of doping, using dynamical mean-field theory and numerical renormalization group techniques.

Findings

Transition between Mott and Kondo insulators at strong coupling

Metallic state stabilized at weak coupling

Doping effects on phase stability

Abstract

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.