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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20230905T140000
DTEND;TZID=Europe/Paris:20230905T153000
DTSTAMP:20260423T043555
CREATED:20230905T082109Z
LAST-MODIFIED:20230905T082109Z
UID:9192-1693922400-1693927800@fermi.univ-tlse3.fr
SUMMARY:Deux modèles de spin aux propriétés inattendues - (Haruki Watanabe / LPT / Seminar). - 05/09/2023\, 14H
DESCRIPTION:Haruki Watanabe (EUniversité de Tokyo) \nSeminar LPT\, 05/09/2023\, 14H\, 3R1\, seminar room\, 3rd floor \nSummary : \nIn 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 dictated by nontrivial entanglement entropy and anyonic excitations. The second one is a spin chain in which a U(1) symmetry may be spontaneously broken at T=0\, although naively such a phase is prohibited by the Hohenberg-Mermin-Wagner theorem. These examples will help our general understanding of quantum many-body systems and complete classification of possible phases of matter.
URL:https://fermi.univ-tlse3.fr/event/deux-modeles-de-spin-aux-proprietes-inattendues-haruki-watanabe-lpt-seminar-05-09-2023-14h/
LOCATION:salle de séminaire 3ème étage\, Bâtiment 3r1 Université Toulouse III\, Toulouse\, 31400\, France
CATEGORIES:Events,LPT,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20230919T140000
DTEND;TZID=Europe/Paris:20230919T153000
DTSTAMP:20260423T043555
CREATED:20230918T084218Z
LAST-MODIFIED:20230919T064713Z
UID:9177-1695132000-1695137400@fermi.univ-tlse3.fr
SUMMARY:High-order diagrammatic expansion around BCS Hamiltonians : Polarized superfluid phase of the attractive Hubbard model - (Félix Werner / LPT / Seminar). - 19/09/2023\, 14H
DESCRIPTION:Félix Werner (ENS\, LKB) \nSeminar LPT\, 19/09/2023\, 14H\, 3R1\, seminar room\, 3rd floor \nSummary : \nIn 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 and to obtain state-of-the-art results for various models of interacting fermions in 2 and 3 dimensions\, mostly in the normal phase. \nWe obtained first results inside a superconducting phase\, for the 3D attractive Hubbard model [1]. Spontaneous symmetry breaking is implemented by expanding around a BCS Hamiltonian. All diagrams up to 12 loops are summed thanks to the connected determinant algorithm [2] with anomalous propagators. Working on the BCS side of the strongly correlated regime\, we observe convergence of the expansion\, and benchmark the results against determinant diagrammatic Monte Carlo [3]. In presence of a polarizing Zeeman field (where unbiased benchmarks are unavailable due to the fermion sign problem) we observe a first-order superconducting-to-normal phase transition\, and a thermally activated polarization of the superconducting phase well captured by a quasiparticle description. We also discuss the large-order behavior of the expansion and its relation to Goldstone and instanton singularities. \n\n[1] G. Spada\, R. Rossi\, F. Simkovic\, R. Garioud\, M. Ferrero\, K. Van Houcke\, F. Werner\, arXiv:2103.12038\n[2] R. Rossi\, PRL 119\, 045701 (2017)\n[3] E. Burovski\, N. Prokof’ev\, B. Svistunov\, M. Troyer\, PRL 96\, 160402 (2006)
URL:https://fermi.univ-tlse3.fr/event/tba-felix-werner-lpt-seminar-19-09-2023-14h/
LOCATION:salle de séminaire 3ème étage\, Bâtiment 3r1 Université Toulouse III\, Toulouse\, 31400\, France
CATEGORIES:Events,LPT,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20230921T140000
DTEND;TZID=Europe/Paris:20230921T153000
DTSTAMP:20260423T043555
CREATED:20230917T072247Z
LAST-MODIFIED:20230919T064724Z
UID:9166-1695304800-1695310200@fermi.univ-tlse3.fr
SUMMARY:Active Nanomaterials for Live Cell Applications.- (Beatriz Pelaz Garcia/LPCNO/Séminaire). – 21/09/2023\, 14H
DESCRIPTION:Beatriz Pelaz Garcia (Universidade de Santiago de Compostela\, Spain) \nSéminaire LPCNO\, amphi GEI13\, INSA\, Bât. 19\, Salle 13 (RDC gauche)
URL:https://fermi.univ-tlse3.fr/event/title-to-be-defined-beatriz-pelaz-garcia-lpcno-seminaire-21-09-2023-14h/
CATEGORIES:Events,LPCNO,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20230922T110000
DTEND;TZID=Europe/Paris:20230922T123000
DTSTAMP:20260423T043555
CREATED:20230916T070046Z
LAST-MODIFIED:20230919T064736Z
UID:9198-1695380400-1695385800@fermi.univ-tlse3.fr
SUMMARY:Explorer la physique du magnétisme quantique avec des atomes de Rydberg individuels . - (Thierry Lahaye/ Seminar/ SFP). - 22/09/2023\, 11H
DESCRIPTION:Thierry Lahaye (CNRS & Institut d’Optique\, Université Paris-Saclay\, Palaiseau) \nLieu : Salle de conférence\, nouveau Bâtiment 3R4 \nRésumé :\nDans ce séminaire\, l’orateur Thierry Lahaye montrera comment\, en utilisant des atomes individuels\, piégés dans des pinces optiques arrangées selon des géométries bien contrôlées\, et en portant ces atomes dans des états électroniques très excités\, dits états de Rydberg\, il est possible de réaliser des systèmes quantiques à N corps décrits par les Hamiltoniens de spins utilisés habituellement pour décrire le magnétisme quantique. Après une brève description des techniques expérimentales utilisées\, quelques résultats récents sur l’étude du modèle d’Ising [1] et du modèle XY [2\,3] seront montrés. \n[1] P. Scholl et al.\, Nature 595\, 233 (2021).\n[2] C. Cheng et al.\, Nature 616\, 691 (2023).\n[3] G. Bornet et al.\, Nature\, sous presse (2023).
URL:https://fermi.univ-tlse3.fr/event/explorer-la-physique-du-magnetisme-quantique-avec-des-atomes-de-rydberg-individuels-thierry-lahaye-seminar-sfp-22-09-2023-11h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,Seminars,SFP / SFC
END:VEVENT
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