Fermi-Surface Reconstruction in the Periodic Anderson Model

TL;DR

This paper investigates quantum phase transitions in the two-dimensional periodic Anderson model, revealing both antiferromagnetic and Fermi-surface reconstruction transitions, with implications for understanding experimental Fermi surface changes.

Contribution

It identifies and characterizes two distinct quantum phase transitions in the model, including a Fermi-surface reconstruction linked to f-electron localization, using variational Monte Carlo methods.

Findings

Identification of antiferromagnetic transition via Fermi surface back-folding

Discovery of Fermi-surface reconstruction due to f-electron localization

Discussion of transitions' relevance to experimental Fermi surface observations

Abstract

We study ground state properties of periodic Anderson model in a two-dimensional square lattice with variational Monte Carlo method. It is shown that there are two different types of quantum phase transition: a conventional antiferromagnetic transition and a Fermi-surface reconstruction which accompanies a change of topology of the Fermi surface. The former is induced by a simple back-folding of the Fermi surface while the latter is induced by localization of $f$ electrons. The mechanism of these transitions and the relation to the recent experiments on Fermi surface are discussed in detail.