Kinks in the periodic Anderson model

TL;DR

This paper investigates the emergence of kinks in the self energy and electronic properties of the periodic Anderson model using dynamical mean field theory with the numerical renormalization group, focusing on strongly correlated f-electron systems.

Contribution

It extends the study of kinks in self energy to the periodic Anderson model, a key model for f-electron systems, using advanced numerical methods.

Findings

Kinks are observed in the self energy of the periodic Anderson model.

The kinks influence the quasi-particle dispersion relation.

Electronic specific heat shows signatures related to the kinks.

Abstract

Recently, dynamical mean field theory calculations have shown that kinks emerge in the real part of the self energy of strongly correlated metals close to the Fermi level. This gives rise to a similar behavior in the quasi-particle dispersion relation as well as in the electronic specific heat. Since f-electron systems are even more strongly correlated than the -hitherto studied- d-electron systems we apply the dynamical mean field approach with the numerical renormalization group method as impurity solver to study whether there are kinks in the periodic Anderson model.