Normal state Landau–Fermi liquidness of pure and doped Sr2RuO4 superconductor

Abstract

Based on local density approximation plus dynamical mean-field theory calculations we explore the normal state of pure and doped Sr${}_2$RuO${}_4$ superconductor, providing a multiparticle description of intrinsic Landau–Fermi liquidness. Self-energy corrections arising from multi-orbital electron–electron interactions lead to a strongly renormalized electronic state relevant to electron mass enhancement and the emergence of coherent Landau–Fermi liquid quasiparticles at low energies. We shed light on the electronic structure evolution of electron/hole doped Sr${}_2$RuO${}_4$ parent compound, showing the orbital-selective electronic state which emerges upon tuning the doping level of Sr${}_2$RuO${}_4$ in the vicinity of the van Hove singularities. This work forms an step forward for understanding the manifestation of anisotropic Coulomb interactions and how Landau–Fermi liquidness emerges in the normal state of Sr${}_2$RuO${}_4$ superconductor.