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X-WR-CALDESC:Évènements pour FeRMI
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DTSTART;TZID=Europe/Paris:20250107T140000
DTEND;TZID=Europe/Paris:20250107T150000
DTSTAMP:20260417T134935
CREATED:20250102T103455Z
LAST-MODIFIED:20250102T103605Z
UID:11322-1736258400-1736262000@fermi.univ-tlse3.fr
SUMMARY:Localization enhancement in gain-loss non-Hermitian disordered models. - (Ivan Khaymovich / LPT / Seminar). - 07/01/2025\, 14H
DESCRIPTION:Séminaire LPT \nIvan Khaymovich (Nordita\, Stockholm) \nSeminar LPT\, 07/01/2025\, 14H\, 3R4\, salle de conférence \nSummary \nRecently the interest in non-Hermitian disordered models has been revived\, due to the claims of instability of a many-body localization to a coupling to a bath.\nTo describe such open quantum systems\, one often focuses on an energy leakage to a bath\, using effective non-Hermitian Hamiltonians. A well-known Hatano-Nelson model [1]\, being a 1d Anderson localization (AL) model\, with different hopping amplitudes to the right/left\, shows AL breakdown\, as non-Hermiticity suppresses the interference. \nUnlike this\, we consider models with the complex gain-loss disorder and show that in general these systems tend to the localization due to non-Hermiticity. \nFirst\, we consider a power-law random banded matrix ensemble (PLRBM) [2]\, known to show AL transition (ALT) at the power of the power-law hopping decay a=d equal to the dimension d. In [3]\, we show that a non-Hermitian gain-loss disorder in PLRBM shifts ALT to smaller values d/2 \nA similar effect of the reduced critical disorder due to the gain-loss complex-valued disorder has been recently observed by us numerically [4]. In order to analytically explain the above numerical results\, we derive an effective non-Hermitian resonance counting and show that the delocalization transition is driven by so-called « bad resonances »\, which cannot be removed by the wave-function hybridization (e.g.\, in the renormalization group approach)\, while the usual « Hermitian » resonances are suppressed. In the last part\, if time permits\, I will consider the effects of non-Hermitian diagonal disorder on many-body localization in interacting systems and the localization in quantum random energy model [5] and show that the above paradigm also works there. \nReferences \n[1] N. Hatano\, D. R. Nelson\, « Localization Transitions in Non-Hermitian Quantum Mechanics »\, Phys. Rev. Lett. 77\, 570 (1996). \n[2] A. D. Mirlin\, Y. V. Fyodorov\, F.-M. Dittes\, J. Quezada\, and T. H. Seligman\, « Transition from localized to extended eigenstates in the ensemble of power-law random banded matrices »\, Phys. Rev. E 54\, 3221–3230 (1996). \n[3] G. De Tomasi\, I. M. K. « Non-Hermiticity induces localization : good and bad resonances in power-law random banded matrices »\, Phys. Rev. B 108\, L180202 (2023).\n\n[4] L. S. Levitov « Absence of localization of vibrational modes due to dipole-dipole interaction »\, Europhys. Lett. 9\, 83 (1989). \n[5] G. De Tomasi\, I. M. K. « Stable many-body localization under random continuous measurements in the no-click limit »\, Phys. Rev. B 109\, 174205 (2024). \n 
URL:https://fermi.univ-tlse3.fr/event/localization-enhancement-in-gain-loss-non-hermitian-disordered-models-ivan-khaymovich-lpt-seminar-07-01-2025-14h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,LPT,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20250109T110000
DTEND;TZID=Europe/Paris:20250109T123000
DTSTAMP:20260417T134935
CREATED:20250109T060653Z
LAST-MODIFIED:20250110T095522Z
UID:11199-1736420400-1736425800@fermi.univ-tlse3.fr
SUMMARY:Atomes Froids. - (Bruno Peaudecerf / LCAR / Seminar). - 9/01/2025\, 11H
DESCRIPTION:Séminaire LCAR \nBruno Peaudecerf (LCAR)
URL:https://fermi.univ-tlse3.fr/event/atomes-froids-bruno-peaudecerf-lcar-seminar-9-01-2025-11h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,LCAR,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20250114T140000
DTEND;TZID=Europe/Paris:20250114T153000
DTSTAMP:20260417T134935
CREATED:20250109T093330Z
LAST-MODIFIED:20250110T095511Z
UID:11212-1736863200-1736868600@fermi.univ-tlse3.fr
SUMMARY:Simulateurs quantiques : perspective pointilliste sur la physique à N corps. - (Eugene Demler / LPT / Seminar). - 14/01/2025\, 14H
DESCRIPTION:Séminaire LPT \nEugene Demler (ETH) \nSeminar LPT\, 14/01/2025\, 14H\, 3R4\, salle de conférence \nSummary : I will discuss recent progress of the optical lattice emulators of the Fermi Hubbard model. The new feature of these experiments is availability of snapshots of many-body states with single particle resolution. I will review new insights from these experiments on the properties of doped Mott insulators\, including demonstration of magnetically mediated pairing. I will discuss how experiments with cold atoms provide new perspective on kinetic magnetism in moire materials.
URL:https://fermi.univ-tlse3.fr/event/tba-eugene-demler-lpt-seminar-14-01-2025-14h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,LPT,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20250123T110000
DTEND;TZID=Europe/Paris:20250123T110000
DTSTAMP:20260417T134935
CREATED:20250120T085039Z
LAST-MODIFIED:20250121T081552Z
UID:11335-1737630000-1737630000@fermi.univ-tlse3.fr
SUMMARY:La tomographie par sonde atomique au service des microscopes électroniques à transmission ?. - (Williams Lefebvre / CEMES / Seminar). - 23/01/2025\, 11H
DESCRIPTION:Séminaire du CEMES \nWilliams Lefebvre (CPM– CAEN) \nSeminar CEMES\, 23/01/2025\, 11H\, salle de conférence
URL:https://fermi.univ-tlse3.fr/event/la-tomographie-par-sonde-atomique-au-service-des-microscopes-electroniques-a-transmission-williams-lefebvre-cemes-seminar-23-01-2025-11h/
LOCATION:salle de conférence du CEMES\, CEMES - 29\, rue Jeanne Marvig BP 94347\, Toulouse\, 31055\, France
CATEGORIES:CEMES,Events,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20250123T110000
DTEND;TZID=Europe/Paris:20250123T123000
DTSTAMP:20260417T134935
CREATED:20250120T051038Z
LAST-MODIFIED:20250121T081543Z
UID:11201-1737630000-1737635400@fermi.univ-tlse3.fr
SUMMARY:Ions-Matière. - (Jean-Philippe Champeaux / LCAR / Seminar). - 23/01/2025\, 11H
DESCRIPTION:Séminaire LCAR \nJean-Philippe Champeaux (LCAR)
URL:https://fermi.univ-tlse3.fr/event/ions-matiere-jean-philippe-champeaux-lcar-seminar-01-23-2025-11h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,LCAR,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20250127T140000
DTEND;TZID=Europe/Paris:20250127T160000
DTSTAMP:20260417T134935
CREATED:20250119T081443Z
LAST-MODIFIED:20250121T081601Z
UID:11364-1737986400-1737993600@fermi.univ-tlse3.fr
SUMMARY:L’IA dans les sciences\, un enjeu de guerre cognitive ? De l’enquête de terrain à l’anticipation des risques de demain. - (Cléo Collomb / FeRMI / Séminaire). - 27/01/2025\, 14H
DESCRIPTION:Séminaires d’ouverture FeRMI\n \nCléo Collomb\,  Maîtresse de conférences à l’Université Paris-Saclay (philosophie des techniques/sciences de l’information et de la communication) \nRésumé :\nL’objectif de la guerre cognitive est de sculpter l’information\, parfois de manière lente et discrète\, pour moduler l’intelligence collective\, devenue une cible. Et si une manière de s’assurer un avantage dans une guerre cognitive était de passer par une attaque de la connaissance et de la production scientifique\, facilitée par l’usage des IA ? Cette séance présentera les premiers résultats du projet SPREADS (Scenarios of Potential Risks Evolution through Algorithms and Data in Sciences)\, financé par l’Agence d’Innovation de Défense\, qui pose l’hypothèse d’une corruption du savoir scientifique (inspirée de la trilogie de Liu Cixin Le problème à trois corps)\, dans un contexte de guerre cognitive totale. Il s’agit\, par le design de fictions spéculatives\, d’entraîner les esprits humains à considérer la nouveauté des conflits à venir qui prennent pour cible la connaissance. \n 
URL:https://fermi.univ-tlse3.fr/event/lia-dans-les-sciences-un-enjeu-de-guerre-cognitive-de-lenquete-de-terrain-a-lanticipation-des-risques-de-demain-cleo-collomb-fermi-seminaire-27-01-2025-14h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,FeRMIsem,Seminars
END:VEVENT
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