Photoemission quasiparticle spectra of Sr2RuO4
Multiband quasiparticle calculations based on perturbation theory and dynamical mean-field methods show that the creation of a photoemission hole state in Sr2RuO4 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.
Liebsch
A
Institut fur Festkorperforschung, Forschungszentrum Julich, 52425 Julich, Germany.
Lichtenstein
A