Periodic Anderson model with d-f interaction

TL;DR

This paper studies an extended periodic Anderson model incorporating d-f interactions, revealing that such interactions sharpen the valence transition region, with variational calculations illustrating changes in f-level occupancy.

Contribution

It introduces a d-f interaction into the periodic Anderson model and analyzes its effects using variational Gutzwiller wave functions, a novel extension.

Findings

Valence transition region is sharpened by d-f interaction.

f-level occupancy varies with f-level energy and interaction strength.

Extended model provides new insights into valence fluctuations.

Abstract

We investigate an extended version of the periodic Anderson model where an interaction is switched on between the doubly occupied d- and f-sites. We perform variational calculations using the Gutzwiller trial wave function. We calculate the f-level occupancy as a function of the f-level energy with different interaction strengths. It is shown that the region of valence transition is sharpened due to the new interaction.