Renormalization of Bulk Magnetic Electron States at High Binding Energies

TL;DR

This study investigates high-energy electron behavior in magnetic Ni(110) using photoemission, revealing significant deviations in quasiparticle self-energy at high binding energies, explained by interactions with spin excitations.

Contribution

It provides the first detailed analysis of magnetic bulk band self-energy deviations at high energies, modeled by spin excitation interactions.

Findings

Deviations in self-energy at 300 meV in magnetic bulk bands

Self-energy well described by spin excitation interaction model

Implications for electron-electron correlation regimes

Abstract

The quasiparticle dynamics of electrons in a magnetically ordered state is investigated by high-resolution angle-resolved photoemission of Ni(110) at 10 K. The self-energy is extracted for high binding energies reaching up to 500 meV, using a Gutzwiller calculation as a reference frame for correlated quasiparticles. Significant deviations exist in the 300 meV range, as identified on magnetic bulk bands for the first time. The discrepancy is strikingly well described by a self-energy model assuming interactions with spin excitations. Implications relating to different electron-electron correlation regimes are discussed.