Correlated electronic states of SrVO3 revealed by angle-resolved photoemission spectroscopy

TL;DR

This review highlights recent ARPES studies on SrVO3, revealing detailed electron correlation effects, quasiparticle behavior, and sub-band structures, advancing understanding of correlated electron systems in transition metal oxides.

Contribution

It provides a comprehensive overview of ARPES findings on SrVO3, including mass renormalization, quasiparticle dispersions, self-energy analysis, and quantum-well states, offering new insights into electron correlations.

Findings

Mass renormalization differences between SrVO3 and CaVO3

Observation of quasiparticle dispersions with kink features

Detection of sub-bands in ultrathin SrVO3 films

Abstract

In this article, we review recent progress in angle-resolved photoemission (ARPES) studies of the Mott-Hubbard-type correlated electron systems SrVO3. It has the d1 electron configuration and is an ideal model compound to study electron correlation effects in normal metal. ARPES studies of bulk single-crystal SrVO3 and CaVO3 have revealed the difference in the mass renormalization of electrons between them. In-situ ARPES studies of thin films fabricated by the pulsed laser deposition method have clarified not only quasi-particle dispersions, which show a kink like high-Tc cuprates, but also finite dispersions in the incoherent part. Self-energy in a wide energy range has been deduced from the ARPES spectral weight using Kramers-Kronig transformation. The obtained self-energy has several structures which yield the incoherent feature and a pseudogap-like dip similar to the high-Tc cuprates. Quantum-well states in ultrathin films of SrVO3 have revealed sub-bands with correlated electrons. These findings of electron correlation effects outlined in the present article would provide a starting point not only for fundamental condensed-matter physics but also for the development of new devices with correlated electrons.