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X-WR-CALDESC:Évènements pour FeRMI
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TZID:Europe/Paris
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DTSTART;TZID=Europe/Paris:20240502T103000
DTEND;TZID=Europe/Paris:20240502T120000
DTSTAMP:20260419T165134
CREATED:20240425T083139Z
LAST-MODIFIED:20240426T083245Z
UID:10349-1714645800-1714651200@fermi.univ-tlse3.fr
SUMMARY:L’évolution temporelle de l’information locale. - (Claudia Artiaco / LPT / Seminar). - 2/05/2024\, 10H30
DESCRIPTION:Claudia Artiaco (KTH\, Stockholm) \nSeminar LPT\, 2/05/2024\, 10H30\, 3R1\, seminar room\, 3rd floor \nAbstract :\nDuring the time evolution of many-body systems entanglement grows rapidly\, limiting exact simulations to small- scale systems and small timescales. Quantum information tends\, however\, to flow towards larger scales without returning to local scales\, such that its detailed large-scale structure does not directly affect local observables. This allows for the removal of large-scale quantum information in a way that preserves all local observables and gives access to large-scale and large-time quantum dynamics. To this end\, in [2] we proposed a novel approach that uses the recently introduced information lattice to organize quantum information into different scales [1]\, allowing us to define local information and information currents which we employ to systematically discard long- range quantum correlations in a controlled way. Our approach relies on decomposing the system into subsystems up to a maximum scale and time evolving the subsystem density matrices by solving the subsystem von Neumann equations in parallel. Importantly\, the information flow needs to be preserved during the discarding of large-scale information. To achieve this without the need to make assumptions about the microscopic details of the information current\, we introduce a second scale at which information is discarded while using the state at the maximum scale to accurately obtain the information flow. The resulting algorithm\, which we refer to as local-information time evolution (LITE)\, is highly versatile and suitable for investigating many-body quantum dynamics in both closed and open quantum systems with diverse hydrodynamic behaviors. \nIn this talk\, I will present results obtained with LITE for the energy transport in the mixed-field Ising model and the magnetization transport in the XX spin chain with onsite dephasing\, where we accurately determine the power-law exponent and the energy diffusion constant [2]. Furthermore\, I will sketch how we used the LITE approach to reproduce and interpret the results found in a recent experiment with NV centers in diamonds [3]. Finally\, I will briefly mention how the information lattice can be employed to obtain insightful results about the spatial structure of entanglement in generic many-body quantum states [4]. \nReferences : \n[1] T. Klein Kvorning\, L. Herviou\, and J. H. Bardarson\, Time-evolution of local information : Thermalization dynamics of local observables\, SciPost Phys. 13\, 080 (2022). \n[2] C. Artiaco\, C. Fleckenstein\, D. Aceituno Chávez\, T. Klein Kvorning\, and J. H. Bardarson\, Efficient Large- Scale Many-Body Quantum Dynamics via Local-Information Time Evolution\, arXiv:2310:06036. \n[3] K. Harkins et al.\, Nanoscale engineering and dynamical stabilization of mesoscopic spin textures\, arXiv:2310:05635. \n[4] C. Artiaco\, T. Klein Kvorning\, D. Aceituno Chávez\, L. Herviou\, and J. H. Bardarson\, In preparation\, 2024.
URL:https://fermi.univ-tlse3.fr/event/levolution-temporelle-de-linformation-locale-claudia-artiaco-lpt-seminar-2-05-2024-10h30/
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:20240516T140000
DTEND;TZID=Europe/Paris:20240516T153000
DTSTAMP:20260419T165134
CREATED:20240512T114028Z
LAST-MODIFIED:20240513T080440Z
UID:10266-1715868000-1715873400@fermi.univ-tlse3.fr
SUMMARY:Confined hyperbolic phonon-polaritons in Van der Waals crystals  . - ( Sébastien Francoeur / LPCNO / Seminar). - 16/05/2024\, 14H
DESCRIPTION:Sébastien Francoeur\,  Université Polytechnique de Montréal\, Canada \nSéminaire LPCNO\, seminar room\, INSA\, Build. 27\, Room 2.20 (2nd floor left) \nSummary \nStrong coupling between an electromagnetic wave and a solid-state polar excitation yields hybrid quasiparticles known as polaritons. Owing to their mixed light-matter characteristics\, polaritons express distinctive properties and enable a unique level of control over light\, matter\, and their interactions. Phonon-polaritons results from the coupling of polar transverse optical phonons with light. In strongly anisotropic nanostructures\, they exhibit a hyperbolic dispersion relation from which high-momentum states become accessible\, providing the means to achieve extreme energy confinement and a large density of states enhancements\, thereby providing new functionalities for IR sensing\, low-loss photonic circuits\, and new regimes of light-matter interactions. \nIn this presentation\, I will delve into the science of hyperbolic photon-polaritons\, illustrating their significance and exploring some of their most promising applications. I will also describe why almost all advances in this field have been driven by a single measurement technique for the last two decades: scattering-type near-field microscopy. Then\, I will then undertake two discussions that may play a role in accelerating key developments in this field: \n\nI will experimentally demonstrate how Raman spectroscopy\, a simple\, convenient\, and widely used technique can be used to investigate phonon-polariton dispersion relations\, strong confinement\, and coupling to other solid-state excitations such as excitons.\nI will introduce a promising polaritonic material\, GaSe\, characterized by low-propagation losses and confinement factors matching or surpassing those reported for other Van der Waals crystals.\n\n 
URL:https://fermi.univ-tlse3.fr/event/confined-hyperbolic-phonon-polaritons-in-van-der-waals-crystals-sebastien-francoeur-lpcno-seminar-16-05-2024-14h/
LOCATION:Salle 220\, LPCNO\, INSA – LPCNO : 135 avenue de Rangueil\, toulouse\, 31077\, France
CATEGORIES:Events,LPCNO,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20240521T140000
DTEND;TZID=Europe/Paris:20240521T153000
DTSTAMP:20260419T165134
CREATED:20240520T083842Z
LAST-MODIFIED:20240521T061137Z
UID:10352-1716300000-1716305400@fermi.univ-tlse3.fr
SUMMARY:Incommensurate order with translationally invariant projected entangled-pair states : Spiral states and quantum spin liquid on the anisotropic triangular lattice. - (Juraj Hasik / LPT / Seminar). - 21/05/2024\, 14H
DESCRIPTION:Juraj Hasik ( Université d’Amsterdam) \nSeminar LPT\, 21/05/2024\, 14H\, the conference hall\, building 3R4\n \nAbstract : \nSimulating strongly correlated systems with incommensurate order poses significant challenges for traditional finite-size-based approaches. Confining such a phase to a finite-size geometry can induce spurious frustration\, with spin spirals in frustrated magnets being a typical example. Here\, we introduce an ansatz based on infinite projected entangled-pair states (iPEPS) which overcomes these limitations and enables the direct search for the optimal spiral in the thermodynamic limit\, with a computational cost that is independent of the spiral’s wavelength. Leveraging this method\, we simulate the Heisenberg model on the anisotropic triangular lattice\, which interpolates between the square and isotropic triangular lattice limits. Besides accurately reproducing the magnetically ordered phases with arbitrary wavelength\, the simulations reveal a quantum spin liquid phase emerging between the Néel and spin spiral phases. \n[1] Juraj Hasik\, Philippe Corboz\, arXiv:2311.05534 \n\n\n\n 
URL:https://fermi.univ-tlse3.fr/event/dynamique-de-la-chiralite-quantique-dans-un-paroi-magnetique-mesoscopique-oleksiy-kolezhuk-lpt-seminar-21-05-2024-14h/
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:20240524T103000
DTEND;TZID=Europe/Paris:20240524T120000
DTSTAMP:20260419T165134
CREATED:20240522T060341Z
LAST-MODIFIED:20240522T093913Z
UID:10372-1716546600-1716552000@fermi.univ-tlse3.fr
SUMMARY:Fake science : panorama des méconduites et contre-feux pour déjouer les pièges. - (Guillaume Cabanac /  Seminar / FeRMI). - 24/05/2024\, 10H30
DESCRIPTION:Séminaires d’ouverture FeRMI\n \nGuillaume Cabanac\,   IRIT (Univ. Toulouse III)  \nRésumé : \nLe problème du ‘fake’ n’épargne pas la science. Cette conférence dressera un panorama des méconduites contemporaines qui polluent la littérature scientifique\, tout en exposant des contre-feux : actions concrètes à intégrer dans nos pratiques pour détecter les arnaques. Le mur des connaissances érigé par les générations de chercheurs doit être le plus robuste possible. Or\, certaines briques empilées récemment sont friables et menacent l’édifice : les maisons d’édition les plus réputées publient des articles non fiables voire bidons. Fabriqués en masse par des paper mills\, ce sont des assemblages de contenus copiés-paraphrasés-collés (produisant l’expression torturée « péril de la poitrine » au lieu de « cancer du sein »\, par exemple) ou générés par ordinateur (Scigen\, Mathgen\, ChatGPT). Les clients rajoutent leurs noms\, usurpent l’identité de coauteurs inventés\, et soumettent à des revues établies mais infiltrées par des éditeurs véreux qui les acceptent (parfois en masse) en quelques semaines. Ils vont même jusqu’à acheter des citations auprès d’agents qui coordonnent des citation cartels. Ces pratiques dystopiques sont pourtant bien réelles et produisent des contenus non fiables\, qui existent au détriment d’une science qu’on souhaiterait la plus fiable possible.
URL:https://fermi.univ-tlse3.fr/event/fake-science-panorama-des-meconduites-et-contre-feux-pour-dejouer-les-pieges-guillaume-cabanac-seminar-fermi-24-05-2024-10h30/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,FeRMIsem,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20240528T140000
DTEND;TZID=Europe/Paris:20240528T153000
DTSTAMP:20260419T165134
CREATED:20240519T084433Z
LAST-MODIFIED:20240522T093209Z
UID:10356-1716904800-1716910200@fermi.univ-tlse3.fr
SUMMARY:Électrons lumineux. - (Klavs Hansen / LPT / Seminar). - 28/05/2024\, 14H
DESCRIPTION:Klavs Hansen (Université de Tianjin\, république populaire de Chine) \nSeminar LPT\, 28/05/2024\, 14H\, 3R1\, seminar room\, 3rd floor \nAbstract :\nThe emission of thermal electromagnetic radiation from hot molecules and clusters has long been assumed to be a simple matter of vibrational transitions. However\, it is becoming increasingly clear that also electrons can be excited thermally and emit photons. The rates for these emissions can reach microsecond timescales for metal clusters\, more than three orders of magnitude shorter than vibrational IR radiation. Besides often occurring on very short time scales\, the rates also are very molecule-specific ; Every electron counts. In the talk I will present the special features that allow experimental determination of the phenomenon\, and give a tour of some results obtained for molecules and clusters. \n[1] Piero Ferrari\, Ewald Janssens\, Peter Lievens\, Klavs Hansen\, Radiative cooling of size-selected gas phase clusters\, Int. Rev. Phys. Chem. 38 (2019) 405-440 \n[2] C. Walther\, G. Dietrich\, W. Dostal\, K. Hansen\, S. Krückeberg\, K. Lützenkirchen and L. Schweikhard\, Radiative Cooling of a Small Metal Cluster : The Case of V^+_13\, Phys. Rev. Lett. 83 (1999) 3816 \n[3] Shimpei Iida\, Wei Hu\, Rui Zhang\, Piero Ferrari\, Kei Masuhara\, Hajime Tanuma\, Haruo Shiromaru\, Toshiyuki Azuma\, and Klavs Hansen\, Thermal radiative cooling of carbon cluster cations C^+_N \, N = 9\, 11\, 12\, 17 − 27\, Mon. Not. R. Astron. Soc. 514 (2022) 844–851 \n 
URL:https://fermi.univ-tlse3.fr/event/electrons-lumineux-klavs-hansen-lpt-seminar-28-05-2024-14h/
LOCATION:salle de séminaire 3ème étage\, Bâtiment 3r1 Université Toulouse III\, Toulouse\, 31400\, France
CATEGORIES:Events,LPT,Seminars
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