Correlation effects in the valence bands of ferromagnetic semiconductor EuS

TL;DR

This paper investigates the temperature-dependent correlation effects in the valence bands of EuS using a combined many-body and first-principles approach, providing insights into its electronic structure and proposing experimental validation via spin-resolved ARPES.

Contribution

It introduces a novel combined theoretical framework to analyze correlation effects in EuS's valence bands and suggests an experimental technique for validation.

Findings

Calculated quasi-particle density of states and spectral density for EuS

Identified temperature-dependent shifts in valence band structure

Proposed spin-resolved ARPES as a tool for experimental verification

Abstract

We present a many body analysis of the multi-band Kondo lattice model. The study is then combined with the first principles TB-LMTO band structure calculations, in order to investigate the temperature dependent correlation effects in the 3$\textit{p}$ valence bands of the ferromagnetic semiconductor EuS. Some of the physical properties of interest like the quasi-particle density of states (Q-DOS), spectral density (SD) and quasi-particle band structure (Q-BS) are calculated and discussed. Therewith, we propose a spin resolved ARPES of the valence bands of EuS to be performed.