Dynamics of valence fluctuations in the extended periodic Anderson model

TL;DR

This paper investigates how dynamical effects in the extended periodic Anderson model induce valence transitions in regimes relevant to experiments, revealing significant spectral and quasiparticle changes observable in experiments.

Contribution

It demonstrates that including dynamics beyond static mean-field makes valence transitions occur in physically relevant parameter regimes.

Findings

Valence transition occurs in experimentally accessible regimes.

Spectral weight transfers are observable in experiments.

Quasiparticle-weight shows strong dependence across the valence crossover.

Abstract

We have investigated the valence transition in the extended periodic Anderson model (EPAM) within the framework of dynamical mean field theory. Previous theoretical studies have indicated the presence of this transition in parameter ranges that are experimentally inaccessible. In this work, we show that, inclusion of dynamics beyond static mean-field brings the valence transition in physically relevant regimes. We show the strong dependence of the quasiparticle-weight scale across the sharp valence crossover. The density of states also exhibit concomitant large scale spectral weight transfers, which can be observed in experiments.