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DTSTART;TZID=Europe/Paris:20241127T140000
DTEND;TZID=Europe/Paris:20241129T120000
DTSTAMP:20260515T000016
CREATED:20241125T091453Z
LAST-MODIFIED:20241126T081952Z
UID:11161-1732716000-1732881600@fermi.univ-tlse3.fr
SUMMARY:Theory days on Computational tools in physics : performances vs. reproducibility . - (Meeting / LPT)\, 27-29/11/2024
DESCRIPTION:Organizers : M. Belkacem\, P. M. Dinh\, and E. Suraud \nAim and objectives\nFollowing the tradition of the previous successful meetings that have started in 2009\, the Theory Days workshop aims at stimulating constructive discussions\, collaborations\, and knowledge exchange among a selected group of theoreticians. This year\, the 16th edition will be dedicated to Computational tools in physics : performances vs. reproducibility. \nThe development of computational codes for structure and dynamics of electronic systems is experiencing new directions of research in relation to the growing availability of artificial intelligence tools. Machine learning is now applied to numerous computational issues in physics and chemistry\, such as for example structure optimization in clusters and molecules. The aim of this year meeting is to address this question in the specific context of dynamical problems\, on the basis of existing computational softwares. To restrict the field\, we shall focus on fully dynamical approaches allowing us to address dynamical scenarios beyond the domain of linear response. The meeting will thus try to summarize today’s situation in the field\, by considering dedicated questions raised by dynamical codes. \nThe problem of reproducibility is becoming a major issue in computational science. The issue is becoming especially important because of the ever increasing complexity of the codes and as computations become bigger and bigger up to a point at which it may become too expansive to make systematic checks. It thus raises the key question of how large differences can be acceptable between results obtained from a given code using various “reasonable’’ parameters and/or various machines. There is a hardware aspect and a physical aspect. We shall try in the meeting to address both aspects on typical examples. \nWe plan to gather people from various groups working in this domain\, mostly in western Europe. The workshop is intended to be a working forum\, thus rather informal. The format will consist in a series of long detailed talks\, typically 1 hour (40 mn talk + 10 mn for questions) focusing in particular on ongoing problems and open issues. We thus urge participants to prepare their talks in this spirit. Ultimately a most efficient organization would consist in having a limited number of talks per representative group in order to avoid doublings. \nsee more details : here
URL:https://fermi.univ-tlse3.fr/event/theory-days-on-computational-tools-in-physics-performances-vs-reproducibility-meeting-lpt-27-29-11-2024/
LOCATION:salle de séminaire 3ème étage\, Bâtiment 3r1 Université Toulouse III\, Toulouse\, 31400\, France
CATEGORIES:Events,LPT,Symposium / Congress
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20241128T133000
DTEND;TZID=Europe/Paris:20241128T180000
DTSTAMP:20260515T000016
CREATED:20241104T154411Z
LAST-MODIFIED:20241114T085430Z
UID:11078-1732800600-1732816800@fermi.univ-tlse3.fr
SUMMARY:Jeudi 28 Novembre 2024\, 14h au CEMES : Vivez une demie journée consacrée à des techniques avancées autour de la microscopie électronique à transmission
DESCRIPTION:Jeudi 28 Novembre 2024\, 14h00 au CEMES : Vivez une demie journée consacrée à des techniques avancées autour de la microscopie électronique à transmission
URL:https://fermi.univ-tlse3.fr/event/jeudi-28-novembre-2024-13h30-au-cemes-vivez-une-demie-journee-consacree-a-des-techniques-avancees-autour-de-la-microscopie-electronique-a-transmission/
LOCATION:salle de conférence du CEMES\, CEMES - 29\, rue Jeanne Marvig BP 94347\, Toulouse\, 31055\, France
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20241128T140000
DTEND;TZID=Europe/Paris:20241128T153000
DTSTAMP:20260515T000016
CREATED:20241124T081906Z
LAST-MODIFIED:20241126T082005Z
UID:11183-1732802400-1732807800@fermi.univ-tlse3.fr
SUMMARY:Magnetic fluctuations in strongly correlated systems: from toy models to realistic materials simulations. - (Maria Chatzieleftheriou / LCPQ/ Séminaire). - 28/11/2024\, 14H00
DESCRIPTION:Séminaire LCPQ \nMaria Chatzieleftheriou\,  Institute for Theoretical Physics\, Goethe University Frankfurt\, Germany \nSummary:\nStrongly correlated electronic systems exhibit intriguing properties and highly complex phase diagrams\, including metal-to-insulator transitions\, magnetic/charge orderings and the field’s holy grail: high temperature superconductivity. Their theoretical description is very challenging and various many-body methods have been developed to this direction. I will present results using state-of-the-art numerical techniques that allow for an accurate description of both strong local electronic correlations and spatial fluctuations. I will discuss the application of this approach on the study of a simple model\, relevant for a series of materials\, where we have analyzed the interplay of Mott physics and magnetic fluctuations. We have identified the Slater and Heisenberg regimes in the phase diagram\, which are separated by a crossover region of competing spatial and local electronic correlations. This bridging of the two limits (the spin-fluctuation dominated Slater regime at weak coupling and the Mott insulator at strong-coupling) had been a key missing ingredient to our understanding of metal-insulator transitions in real materials. I will\, moreover\, present results of a recent work on the perovskite Sr2RuO4 compound\, where we have performed realistic calculations and have accurately reproduced the experimentally estimated magnetic susceptibility\, resolving a long-standing discrepancy\, in the community\, between theory and experiment.
URL:https://fermi.univ-tlse3.fr/event/magnetic-fluctuations-in-strongly-correlated-systems-from-toy-models-to-realistic-materials-simulations-maria-chatzieleftheriou-lcpq-seminaire-28-11-2024-14h00/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,LCPQ,Seminars
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