DQMP Seminar - Recent insights on the normal state of Sr2RuO4: High-resolution photoemission and Hall effect

18.06.2019 13:00 – 14:30

In this talk I will present recent experimental and theoretical results on electron-electron correlations and spin-orbit coupling in the model Fermi liquid Sr2RuO4. High-resolution laser-based photoemission spectroscopy measurements of the Fermi surface confirm the importance of spin-orbit coupling in this material and reveal that its effective value is enhanced by a factor of about two. Further, the analysis of self-energies extracted directly from the experimental data strongly supports the notion of dominantly local-orbital self-energies, where the momentum-dependence of quasiparticle states arises from substantial orbital mixing induced by the spin-orbit coupling. Our results, which are in near quantitative agreement with single-site dynamical mean-field theory calculations, provide also evidence for an electronic origin of the observed non-linear frequency dependence of the self-energies. These insights are for example of immediate relevance to understand the puzzling temperature dependence of the Hall coefficient with its two sign reversals.

Lieu

Bâtiment: Ecole de Physique

Auditoire Stückelberg

entrée libre