Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 27: Correlated Electrons: Other Materials
TT 27.6: Talk
Tuesday, March 19, 2024, 10:45–11:00, H 3010
Superconductivity and Mottness in Organic Charge Transfer Materials — Henri Menke1,2, Marcel Klett1, Kazushi Kanoda1,3, Antoine Georges4, Michel Ferrero5, and •Thomas Schäfer1 — 1Max-Planck-Institut für Festkörperforschung, Stuttgart — 2University of Erlangen-Nürnberg — 3University of Stuttgart — 4Center for Computational Quantum Physics, Flatiron Institute — 5CPHT, CNRS, École Polytechnique, Palaiseau
The phase diagrams of organic superconductors assemble a plethora of fundamental phenomena of strongly correlated systems in two dimensions. We analyze a minimal model for these compounds, the Hubbard model on an anisotropic triangular lattice, by means of cutting-edge quantum embedding methods, respecting the lattice symmetry. We determine the crossover from a Fermi liquid to a Mott insulator by momentum-selective destruction of the Fermi surface reminiscent of a pseudogap. In the immediate vicinity of the metal-insulator crossover we demonstrate the existence of unconventional superconductivity by directly entering the symmetry-broken phase. Our results are in remarkable agreement with experimental phase diagrams of κ-organics for which we motivate future spectroscopic studies of hot and cold spots.
Keywords: Organic superconductors; Mott insulators; Frustrated magnetism; Hubbard model; Dynamical mean-field theory