Single particle spectrum of the flux phase in the FM Kondo Model

TL;DR

This paper explores the electronic spectrum of the flux phase in a 2D ferromagnetic Kondo lattice model, revealing how finite-size effects and thermal fluctuations influence the spectrum compared to idealized models.

Contribution

It provides the first detailed analysis of the single particle spectrum of the flux phase in the FM Kondo model using unbiased Monte Carlo simulations.

Findings

Flux phase observed under certain doping and J' conditions.

Spectrum differs from ideal infinite lattice but matches finite lattice with thermal fluctuations.

Identifies paramagnetism, weak ferromagnetism, and flux phase regimes.

Abstract

We investigate the 2D ferromagnetic Kondo lattice model for manganites with classical corespins at Hund's rule coupling J_H=6, with antiferromagnetic superexchange 0.03 < J' < 0.05. We employ canonical and grand canonical unbiased Monte Carlo simulations and find paramagnetism, weak ferromagnetism and the Flux phase, depending on doping and on J'. The observed single particle spectrum in the flux phase differs from the idealized infinite lattice case, but agrees well with an idealized finite lattice case with thermal fluctuations.