Self-Energy Effects on the Low- to High-Energy Electronic Structure of SrVO3

TL;DR

This study investigates the electronic structure of SrVO3 using photoemission spectroscopy, revealing band renormalization features and self-energy effects linked to electron-electron interactions, providing insights into correlated electron behavior.

Contribution

It presents a detailed analysis of self-energy effects in SrVO3, connecting spectral features to electron-electron interactions and band renormalization, which was not previously characterized in this detail.

Findings

Observation of a sharp kink ~60 meV below EF

Detection of a high-energy kink ~0.3 eV below EF

Identification of a large energy scale ~0.7 eV in self-energy

Abstract

The correlated electronic structure of SrVO3 has been investigated by angle-resolved photoemission spectroscopy using in-situ prepared thin films. Pronounced features of band renormalization have been observed: a sharp kink ~60 meV below the Fermi level (EF) and a broad so-called "high-energy kink" ~0.3 eV below EF as in the high-Tc cuprates although SrVO3 does not show magnetic fluctuations. We have deduced the self-energy in a wide energy range by applying the Kramers-Kronig relation to the observed spectra. The obtained self-energy clearly shows a large energy scale of ~0.7 eV which is attributed to electron-electron interaction and gives rise to the ~0.3 eV "kink" in the band dispersion as well as the incoherent peak ~1.5eV below EF. The present analysis enables us to obtain consistent picture both for the incoherent spectra and the band renormalization.