Non-quasiparticle states in the core level spectra of ferromagnetic semiconductors and half-metallic ferromagnets

TL;DR

This paper demonstrates that non-quasiparticle states in ferromagnetic semiconductors and half-metals can be observed via core level x-ray spectra, with core hole effects significantly enhancing their spectral contributions.

Contribution

It introduces a theoretical approach to identify non-quasiparticle states in core level spectra considering core hole effects within the s-d exchange model.

Findings

NQP states can be observed in core level spectra.

Core hole effects enhance NQP contributions in x-ray scattering.

Theoretical calculations support experimental detection of NQP states.

Abstract

The Green's functions that determine x-ray spectra are calculated in the s-d exchange model of a saturated conducting ferromagnet in the presence of the core hole. A possibility to observe non-quasiparticle (NQP) states in the core level (x-ray absorption, emission and photoelectron) spectroscopy is demonstrated. It is shown that NQP contributions to resonant x-ray scattering spectra can be considerably enhanced by core hole effects in comparison with those to the density of states.