Lifshitz Transitions in Magnetic Phases of the Periodic Anderson Model

TL;DR

This paper explores Lifshitz transitions in magnetic phases of the periodic Anderson model, revealing how Fermi surface reconstructions relate to itinerant-localized electron transitions using variational Monte Carlo methods.

Contribution

It demonstrates the occurrence of Lifshitz transitions in magnetic phases of the model and links these to changes in electron localization, using Gutzwiller wavefunctions.

Findings

Lifshitz transitions occur in both antiferromagnetic and ferromagnetic phases.

Transitions are associated with large ordered-moment states.

Fermi surface reconstructions relate to itinerant-localized electron behavior.

Abstract

We investigate the reconstruction of a Fermi surface, which is called a Lifshitz transition, in magnetically ordered phases of the periodic Anderson model on a square lattice with a finite Coulomb interaction between f electrons. We apply the variational Monte Carlo method to the model by using the Gutzwiller wavefunctions for the paramagnetic, antiferromagnetic, ferromagnetic, and charge-density-wave states. We find that an antiferromagnetic phase is realized around half-filling and a ferromagnetic phase is realized when the system is far away from half-filling. In both magnetic phases, Lifshitz transitions take place. By analyzing the electronic states, we conclude that the Lifshitz transitions to large ordered-moment states can be regarded as itinerant-localized transitions of the f electrons.