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DTSTART;TZID=Europe/Paris:20260505T140000
DTEND;TZID=Europe/Paris:20260505T153000
DTSTAMP:20260504T072414Z
CREATED:20260504T075434Z
LAST-MODIFIED:20260504T072414Z
UID:12085-1777989600-1777995000@fermi.univ-tlse3.fr
SUMMARY:Comment la géométrie et la topologie rendent les matériaux rigides… ou étonnamment souples. - (Christian D Santangelo / LPT / Seminar). -5/05/2026\, 14H
DESCRIPTION:Séminaire LPT \nChristian D Santangelo (Université de Syracuse) \nSeminar LPT\, 5/05/2026\, 14H\, 3R4\, salle de conférence\n\nSummary\nThe materials of biology\, from sharkskin to cartilage to wood\, regularly out-perform their synthetic equivalents. Organisms can achieve this because their materials have precise geometric structures that endow them with tailored mechanical properties that can often be changed in situ. It has recently become possible to fabricate comparable structures\, but we still seem to understand little about how geometry and mechanics are intertwined. \nThis talk will discuss why this is a hard problem (NP-hard actually)\, and highlight new work by my group and collaborators that are starting to unveil new connections between geometry and mechanics. This new understanding has allowed us to design materials that can change their mechanical properties\, changing from rigid to floppy due to the imposition of internal stresses.
URL:https://fermi.univ-tlse3.fr/event/tba-christian-d-santangelo-lpt-seminar-5-05-2026-14h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,LPT,Seminars
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260507T110000
DTEND;TZID=Europe/Paris:20260507T120000
DTSTAMP:20260504T072537Z
CREATED:20260503T083622Z
LAST-MODIFIED:20260504T072537Z
UID:12109-1778151600-1778155200@fermi.univ-tlse3.fr
SUMMARY:Réseaux de tenseurs pour des géométries arbitraires : applications aux systèmes frustrés et à la simulation de circuits quantiques. - (Saeed Jahromi / LPT / Seminar). -7/05/2026\, 14H
DESCRIPTION:Séminaire LPT \nSaeed Jahromi (IASBS) \nSeminar LPT\, 7/05/2026\, 11H\, 3R4\, salle de conférence \nSummary\nIn this talk\, I will present recent advances in tensor network (TN) methods for the accurate simulation of quantum many-body systems on arbitrary geometries. In particular\, I will discuss how to overcome the challenges of applying TN methods to different lattice structures and dimensions. I will then present three representative applications: (i) the Heisenberg antiferromagnet on the square–kagome lattice\, where frustration stabilizes nontrivial valence-bond crystal phases\, (ii) the Kitaev–Heisenberg model on the bilayer honeycomb lattice\, highlighting competing magnetic and quantum spin liquid phases\, and (iii) tensor-network-based simulation of quantum circuits relevant to recent IBM experiments.
URL:https://fermi.univ-tlse3.fr/event/tba-csaeed-jahromi-lpt-seminar-7-05-2026-14h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,LPT,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260512T140000
DTEND;TZID=Europe/Paris:20260512T150000
DTSTAMP:20260422T070538Z
CREATED:20260412T083744Z
LAST-MODIFIED:20260422T070538Z
UID:11992-1778594400-1778598000@fermi.univ-tlse3.fr
SUMMARY:Dynamique quantique de la chiralité d’une paroi de domaine magnétique mésoscopique. - (Oleksiy Kolezhuk / LPT / Seminar). - 12/05/2026\, 14H
DESCRIPTION:Séminaire LPT \nOleksiy Kolezhuk\, (Institut du Magnétisme\, ANS\, Ukraine) \nSeminar LPT\, 12/05/2026\, 14H\, 3R4\, salle de conférence \nSummary\nWe study the quantum dynamics of the internal chirality degree of freedom of a mesoscopic domain wall pinned inside a quasi-one-dimensional fixture. It is shown that weak spin-polarized current excites Bloch oscillations of the domain wall angular rotation velocity\, with the oscillation frequency proportional to the current\, modulated by a much higher magnon-range frequency. In addition to that\, the Wannier-Stark localization effects enable controlled switching between different chiral states\, suppressing inertial effects characteristic for the classical regime. \nThe current density required for the chirality manipulation can be significantly lower compared to the classical regime. We also show that for recently discovered novel class of magnetic materials — altermagnets — chirality switching can be driven by the usual (non-spin-polarized)\ncurrent. \n[1] O. Kolezhuk\, R. Teslia\, I. Buryak\, and O. Gomonay\, Phys. Rev. B 109\, 134418 (2024)
URL:https://fermi.univ-tlse3.fr/event/dynamique-quantique-de-la-chiralite-dune-paroi-de-domaine-magnetique-mesoscopique-oleksiy-kolezhuk-lpt-seminar-12-05-2026-14h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,LPT,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260526T140000
DTEND;TZID=Europe/Paris:20260526T150000
DTSTAMP:20260522T083425Z
CREATED:20260522T064321Z
LAST-MODIFIED:20260522T083425Z
UID:12114-1779804000-1779807600@fermi.univ-tlse3.fr
SUMMARY:Fermi-Hubbard SU(N) et au-delà : brisure de la symétrie ZL dans des boîtes quantiques à température nulle et finie. - (Loïc Herviou / LPT / Seminar). -26/05/2026\, 14H
DESCRIPTION:Séminaire LPT \nLoïc Herviou (LPMMC) \nSeminar LPT\, 26/05/2026\, 14H\, 3R4\, salle de conférence \nSummary\nLarge symmetries are both a curse (larger Hilbert space) and a boon (large irreducible representations) for numerical studies.\nIn this presentation\, I will discuss the method introduced by T. Botzung and P. Nataf in Phys. Rev. Lett. 132 (2023) to tackle optimally Fermi-Hubbard models with SU(N) symmetries. I will exemplify the drastic speedups in an unconventional thermodynamic limit of both large number of colors and particles\, and small number of sites. Using a combination of numerical simulations and analytical computation\, we get the exact\, finite and zero temperature\, phase diagrams with systems including several thousand particles.\nIf time allows\, we will discuss generalization of this approach to other Lie groups and models.
URL:https://fermi.univ-tlse3.fr/event/tba-loic-herviou-lpt-seminar-26-05-2026-14h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,LPT,Seminars
END:VEVENT
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