Photoemission Quasi-Particle Spectra of Sr$_2$RuO$_4$

Details Photoemission Quasi-Particle Spectra of Sr$_2$RuO$_4$ Photoemission Quasi-Particle Spectra of Sr$_2$RuO$_4$

1999-09-29

arxiv.org/abs/cond-mat/9909433v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, to be published in PRB Rapid Comm

Scientific paper

10.1103/PhysRevLett.84.1591

Multi-band quasi-particle calculations based on perturbation theory and dynamical mean field methods show that the creation of a photoemission hole state in Sr$_2$RuO$_4$ is associated with a highly anisotropic self-energy. Since the narrow Ru-derived $d_{xz,yz}$ bands are more strongly distorted by Coulomb correlations than the wide $d_{xy}$ band, charge is partially transferred from $d_{xz,yz}$ to $d_{xy}$, thereby shifting the $d_{xy}$ van Hove singularity close to the Fermi level.

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