Physique De La Matière Condensée

Antoine GeorgesPhysique de la matière condenséeAnnée 2024-2025Colloque : Recent Advances and Applications of Diagrammatic Monte Carlo for FermionsMichel Ferrero : Origin and Fate of the Pseudogap in the Doped Hubbard Model: A Diagrammatic Monte Carlo StudyMichel FerreroÉcole Polytechnique, CPHT, Collège de FranceRésuméIn this seminar, I will introduce the diagrammatic Monte Carlo method and discuss its application to the two-dimensional Hubbard model at finite temperature. The results obtained through this approach are controlled and, importantly, address the infinite-size limit of the model, thus yielding physical quantities with arbitrary momentum resolution. This enables a detailed investigation of the impact of electronic correlations on the spectral properties, with a particular focus on the Fermi surface topology and the pseudogap regime. We demonstrate the selective suppression of quasiparticle excitations near the antinodal regions due to the development of magnetic correlations, observed both in the