Momentum distribution functions in a one-dimensional extended periodic Anderson model

TL;DR

This paper investigates how interorbital interactions affect electron momentum distribution in a one-dimensional extended periodic Anderson model, revealing delocalization, localization, and strong correlations depending on interaction strength and filling.

Contribution

It introduces analysis of momentum distribution functions considering interorbital interactions in a one-dimensional extended periodic Anderson model, highlighting new localization and correlation phenomena.

Findings

Increased $U_{cf}$ delocalizes $f$ electrons at half-filling.

Beyond a threshold $U_{cf}$, both $f$ and conduction electrons become localized.

In less than half-filled cases, $U_{cf}$ induces strong correlations in the mixed valence regime.

Abstract

We study the momentum distribution of the electrons in an extended periodic Anderson model, where the interaction, $U_{cf}$, between itinerant and localized electrons is taken into account. In the symmetric half-filled model, due to the increase of the interorbital interaction, the $f$ electrons become more and more delocalized, while the itinerancy of conduction electrons decreases. Above a certain value of $U_{cf}$ the $f$ electrons become again localized together with the conduction electrons. In the less than half-filled case, we observe that $U_{cf}$ causes strong correlations between the $f$ electrons in the mixed valence regime.