Haruki Watanabe (EUniversité de Tokyo) Seminar LPT, 05/09/2023, 14H, 3R1, seminar room, 3rd floor Summary : In this talk, I will introduce two series of simple spin models with unusual properties. The first one is a modified Toric code that may have a unique ground state under periodic boundary condition, despite its nontrivial topological order… Read More »Deux modèles de spin aux propriétés inattendues – (Haruki Watanabe / LPT / Seminar). – 05/09/2023, 14H

Félix Werner (ENS, LKB) Seminar LPT, 19/09/2023, 14H, 3R1, seminar room, 3rd floor Summary : In contrast to conventional QMC methods, expansions of intensive quantities in series of connected Feynman diagrams can be formulated directly in the thermodynamic limit. Over the last decade, diagrammatic Monte Carlo algorithms made it possible to reach large expansion orders… Read More »High-order diagrammatic expansion around BCS Hamiltonians : Polarized superfluid phase of the attractive Hubbard model – (Félix Werner / LPT / Seminar). – 19/09/2023, 14H