Temperature-dependent quasiparticle band structure of the ferromagnetic semiconductor EuS

TL;DR

This study investigates how the electronic structure of EuS, a ferromagnetic semiconductor, varies with temperature by combining many-body models and first-principles calculations, revealing detailed spectral and quasiparticle properties.

Contribution

It introduces a combined theoretical approach that integrates a multiband Kondo-lattice model with first-principles calculations to accurately analyze temperature-dependent electronic structures of EuS.

Findings

Temperature-dependent spectral densities of EuS

Quasiparticle band structures across temperatures

Correlation effects on the energy spectrum

Abstract

We present calculations for the temperature-dependent electronic structure of the ferromagnetic semiconductor EuS. A combination of a many-body evaluation of a multiband Kondo-lattice model and a first-principles T=0--bandstructure calculation (tight-binding linear muffin-tin orbital (TB-LMTO)) is used to get realistic information about temperature- and correlation effects in the EuS energy spectrum. The combined method strictly avoids double-counting of any relevant interaction. Results for EuS are presented in terms of spectral densities, quasiparticle band structures and quasiparticle densities of states, and that over the entire temperature range.