Multiple Lifshitz transitions driven by short-range antiferromagnetic correlations in the two-dimensional Kondo lattice model

TL;DR

This paper investigates how short-range antiferromagnetic correlations induce multiple Lifshitz transitions in the Fermi surface of the two-dimensional Kondo lattice model, revealing complex phase behavior.

Contribution

It introduces a mean field approach to analyze the impact of antiferromagnetic correlations on Fermi surface topology in the Kondo lattice model, identifying multiple Lifshitz transitions.

Findings

Multiple Lifshitz phase transitions occur at zero temperature.

Fermi surface structure changes dramatically with increasing superexchange coupling.

Short-range antiferromagnetic correlations significantly influence the electronic phases.

Abstract

With a mean field approach, the heavy Fermi liquid in the two-dimensional Kondo lattice model is carefully considered in the presence of short-range antiferromagnetic correlations. As the ratio of the local Heisenberg superexchange coupling to the Kondo coupling increases, the Fermi surface structure changes dramatically. From the analysis of the ground state energy density, multiple Lifshitz type phase transitions occur at zero temperature.