Seminar video now available

Watch Thomas Schäfer's talk "Multi-method, multi-messenger approaches to models of strong correlations" now

The video of the talk Multi-method, multi-messenger approaches to models of strong correlations given by Thomas Schäfer of the Max Planck Institute for Solid State Research on November 24, 2022 is now available on YouTube.

Abstract: The Hubbard model is the paradigmatic model for electronic correlations. In this talk I present a general framework for the reliable calculation of its properties, which we coined 'multi-method, multi-messenger' approach. I will illustrate the power of this approach with three recent studies: (i) an extensive synopsis of arguably all available finite-temperature methods for the half-filled Hubbard model on a simple square lattice in its weak-coupling regime and (ii) a complementary subset of those applied to the Hubbard model on a triangular geometry. While the former example fully clarifies the impact of spin fluctuations and tracks it footprints on the one- and two-particle level, the latter exhibits the intriguing interplay of geometric frustration (magnetism) and strong correlations (Mottness). As a last example, (iii) I will show the application to a model system for the magnetic properties of an actual material, the infinite layer nickelate compound LaNiO2, whose magnetic susceptibility exhibits non-Curie-Weiss behavior at low temperatures . These examples may work as a blueprint for similar future studies of strongly correlated systems.