Low-temperature coherence in the periodic Anderson model: Predictions for photoemission of heavy Fermions

TL;DR

This paper provides exact numerical predictions for the periodic Anderson model to interpret photoemission experiments on heavy Fermion systems, highlighting differences from the impurity model and explaining experimental observations.

Contribution

It introduces a comprehensive interpretation of photoemission data using the lattice model, bridging impurity and Hubbard regimes, which was not previously achieved.

Findings

Lattice model explains enhanced photoemission intensity and dispersion.

Identifies a crossover from impurity to Hubbard regimes.

Accounts for weak temperature dependence of the Kondo peak.

Abstract

We present numerically exact predictions of the periodic and single-impurity Anderson models to address photoemission experiments on heavy Fermion systems. Unlike the single impurity model the lattice model is able to account for the enhanced intensity, dispersion, and apparent weak temperature dependence of the Kondo resonant peak seen in recent controversial photoemission experiments. We present a consistent interpretation of these results as a crossover from the impurity regime to an effective Hubbard model regime described by Nozieres.