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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260911T110000
DTEND;TZID=Europe/Paris:20260911T120000
DTSTAMP:20260903T154443Z
CREATED:20260903T154413Z
LAST-MODIFIED:20260903T154443Z
UID:10000239-1789124400-1789128000@sfp-alpes.fr
SUMMARY:William FAUGNO (LKB)
DESCRIPTION:Topology in the Many-Body Spectrum: A Spectral Localizer Approach to Quantum Scars\nRésumé : \nTopological phases\, both single-particle and many-body\, are often formulated through momentum-space invariants\, many of which rely on the presence of a spectral gap. However\, disorder and gapless spectra can make these conventional approaches difficult to apply. The spectral localizer provides an alternative real-space framework for defining and characterizing topology in such settings. By combining the Hamiltonian with position operators\, it constructs a pseudospectrum that can identify topologically protected states while simultaneously providing a measure of their spectral stability. The spectral localizer has been successfully applied to a variety of single-particle systems\, including disordered and gapless systems. In this seminar\, I will present recent work extending the spectral localizer to many-body systems. Our construction provides a general pseudospectral framework for identifying topologically protected states throughout the many-body spectrum. We have used this framework to identify candidates for quantum many-body scarring in both an interacting chiral bosonic chain and the PXP model\, demonstrating that the approach is not tied to a particular microscopic mechanism for scarring. The many-body spectral localizer thus provides new insight into the structure and stability of these anomalous ETH-violating states\, while offering a quantitative measure of their stability. Finally\, I will discuss the implications of this framework for quantum error-correcting codes constructed from quantum many-body scar subspaces. \nContact : jeanne.colbois@neel.cnrs.fr \nLe séminaire théorie est financé par la fédération de recherche Quantalps.
URL:https://sfp-alpes.fr/event/william-faugno-lkb/
LOCATION:LPMMC – salle Roger Maynard (G421)\, CNRS - LPMMC 25 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260914T110000
DTEND;TZID=Europe/Paris:20260914T120000
DTSTAMP:20260910T140135Z
CREATED:20260910T140135Z
LAST-MODIFIED:20260910T140135Z
UID:10000241-1789383600-1789387200@sfp-alpes.fr
SUMMARY:Daniel DUFFY (Cambridge\, UK)
DESCRIPTION:Mechanics and geometry of nematic shape-morphing sheets\n\nRésumé : \nThin ‘shape-programmed’ sheets morph into curved shapes when stimulated by heat\, light\, or chemical fuel. Biology is full of intricate examples (leaves\, petals\, etc)\, and soft synthetic materials such as liquid-crystal elastomers have begun to approach similar levels of richness\, opening doors to bio-inspired soft machines. Such machines can lift\, pump\, push\, pull\, . . . etc\, promising myriad applications including microfluidic components\, deployable structures\, switchable surfaces\, and robotic actuators. I’ll present work on nematic shape morphers\, in which the direction of anisotropic deformation is patterned\, while deformation magnitudes are spatially uniform. The focus will be on encoding Gauss curvature\, which imparts mechanical strength to the resultant structures\, as Gauss understood centuries ago. The patterned deformation direction must typically be chosen at the time of manufacture\, leading to a design limitation: the morphing sheet can only realise a single target shape. I will then show how to overcome this limitation\, by varying the deformation magnitude (e.g. via patterned illumination) in both space and time. This new paradigm allows a single physical sample to be morphed into arbitrarily many different shapes at will. Thus a designer can specify entire time-dependent motions of the sheet. This capability could greatly increase the versatility of soft robots\, e.g. when operating in confined environments or performing complex tasks. Furthermore\, it facilitates swimming\, which typically requires non-reciprocal motion. More generally\, it unlocks the full potential of shape-morphing sheets\, allowing them to progress from being merely functional to being truly multi-functional. \n_ \nContact : emmanuel.siefert@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/daniel-duffy-cambridge-uk/
LOCATION:LiPhy – Salle de conférence\, LiPhy 140 avenue de la Physique\, St Martin d'Hères\, 38402\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260914T140000
DTEND;TZID=Europe/Paris:20260914T150000
DTSTAMP:20260910T141150Z
CREATED:20260910T141150Z
LAST-MODIFIED:20260910T141150Z
UID:10000242-1789394400-1789398000@sfp-alpes.fr
SUMMARY:Alberto CARTA ( Laboratory for Material simulations\, Paul Scherrer Institut\, Villigen)
DESCRIPTION:Of bandits and Bohr magnetons : balancing exploration and exploitation in magnetic landscapes\nRésumé : \nThe energy landscape of strongly interacting magnetic materials is a high-dimensional\, rugged terrain populated by a multitude of metastable states with distinct magnetizations\, oxidation states\, and orbital orders. Identifying the true ground state within this complexity remains a significant hurdle for the computational design of materials with tunable magnetic properties.\nBuilding on the work of Ponet et al. [1\,2]\, we systematically characterize this terrain to reveal the fundamental drivers of its complexity. We trace its origins to a core competition between the DFT functional’s preference for delocalization and the Hubbard +U correction’s drive for localization. This primary conflict is further modulated by a hierarchy of magnetic interactions\, including Hund’s coupling\, superexchange\, and Kugel-Khomskii physics\, which collectively define the energetic valleys and barriers across both high and low energy scales.\nTo overcome these barriers\, we propose a novel approach inspired by a completely different field: advertisement/recommendation engines (contextual Bandits) currently powering social media feeds and large parts of the Internet. By leveraging bandit strategies that balance the exploration of unknown configurations with the exploitation of known areas\, we demonstrate an efficient method for navigating this landscape. Our results show that these strategies successfully identify the lowest energy states where traditional methods often fail\, providing a robust framework for predicting and engineering the properties of strongly correlated magnetic materials. \n[1] Ponet\, L.\, Di Lucente\, E.\, & Marzari\, N. (2024). The energy landscape of magnetic materials. npj Computational Materials\, 10(1)\, 151.\n[2] Haddadi\, F.\, Campi\, D.\, dos Santos\, F.\, Mounet\, N.\, Ponet\, L.\, Marzari\, N.\, & Gibertini\, M. (2025). Exploring the magnetic landscape of easily-exfoliable two-dimensional materials (arXiv:2509.09531v2). \n_ \nContact : matteo.dastuto@neel.cnrs.fr
URL:https://sfp-alpes.fr/event/alberto-carta-laboratory-for-material-simulations-paul-scherrer-institut-villigen/
LOCATION:CNRS – Salle Louis Weil (E424)\, CNRS - Institut Néel 25 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260914T140000
DTEND;TZID=Europe/Paris:20260914T150000
DTSTAMP:20260903T152520Z
CREATED:20260903T152520Z
LAST-MODIFIED:20260903T152520Z
UID:10000237-1789394400-1789398000@sfp-alpes.fr
SUMMARY:Gabriel GARCIA JIMENEZ  (Institut Laue-Langevin)
DESCRIPTION:Proton-induced reactions on 238U in inverse kinematics : probing fission through nucleon knockout\nRésumé : \nIn this seminar\, I will present a study of proton-induced reactions on 238U in inverse kinematics\, performed at 540 AMeV with the R3B/SOFIA setup at GSI. The experiment provides access to the different reaction channels and\, in particular\, to the fission of the protactinium residue following nucleon knockout. \nI will discuss how the excitation energy of the residual nucleus was reconstructed from the kinematics of the emitted nucleons and how it can be correlated with the charge distribution of the fission fragments. This provides a way to investigate the evolution of shell effects with excitation energy and to test different theoretical descriptions of this process. The experimental results will be compared with calculations based on the INCL and ABLA07 models. \nFinally\, I will show the measured cross sections for the main spallation-evaporation and spallation-fission channels and compare them with previous experimental data and theoretical predictions. Overall\, the results provide insight into the interplay between nucleon knockout\, nuclear excitation\, and fission in relativistic proton-induced reactions on heavy nuclei. \nHenry Fischer (College 3 Secretary) \nExternal visitors may ask for a site access to : dubouloz@ill.fr \nZoom link : https://ill.zoom.us/j/7804743065?pwd=vYbib10VNk56W5mHOHB2QhzTBEyT0J.1&omn=95143035964 – Password : SeminarC3 \n 
URL:https://sfp-alpes.fr/event/gabriel-garcia-jimenez-institut-laue-langevin/
LOCATION:ILL – Salle de Séminaire (110-111)\, ILL 50 71 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260918T090000
DTEND;TZID=Europe/Paris:20260918T110000
DTSTAMP:20260910T153044Z
CREATED:20260903T144246Z
LAST-MODIFIED:20260910T153044Z
UID:10000234-1789722000-1789729200@sfp-alpes.fr
SUMMARY:Soutenance de Thèse par Soline BEITONE
DESCRIPTION:Développement et évaluation d’un système de photocatalyse pour la réduction et la valorisation du CO2\nRésumé : \nCette thèse porte sur le développement et l’évaluation de systèmes photocatalytiques dédiés à la réduction et à la valorisation du CO2\, tout en explorant des applications complémentaires en dépollution environnementale\, notamment pour le traitement des eaux. Réalisé dans le cadre du projet multidisciplinaire DefiCO2\, ce travail s’inscrit dans la démarche Safe-and-Sustainable-by-Design (SSbD)\, avec pour objectif de développer des membranes photocatalytiques autoportées à base de Cu2O\, conçues comme des systèmes réutilisables\, durables et compatibles avec un déploiement à grande échelle. \nLe Cu2O\, un semi-conducteur de type p\, abondant\, non toxique et capable d’absorber la lumière visible\, a été synthétisé sous forme de nanofils à fort rapport d’aspect par une approche hydrothermale simple\, basée sur la réaction de Fehling\, réalisée à basse pression et basse température en utilisant le glucose comme agent bioréducteur. Les membranes ont ensuite été élaborées par un procédé simple et peu coûteux\, transposable à l’échelle industrielle. \nAfin d’améliorer leurs performances photocatalytiques\, des nanoparticules de TiO2 synthétisées par une voie combinant sol-gel et traitement hydrothermal ont été incorporées pour former des hétérojonctions p–n favorisant la séparation des porteurs de charge. L’influence de différentes teneurs en TiO2 sur les propriétés et les performances des membranes a été étudiée pour la réduction photocatalytique du CO2 en CO et CH4\, ainsi que pour le traitement des eaux\, notamment par la dégradation de polluants organiques tels que l’Orange G. Des investigations mécanistiques ont permis de mieux comprendre les mécanismes de transfert de charge au sein de l’hétérojonction\, les processus gouvernant l’activité photocatalytique ainsi que les voies réactionnelles associées. \nEnfin\, une analyse du cycle de vie (ACV) a été réalisée afin d’évaluer les impacts environnementaux des matériaux développés en vue de leur futur déploiement à grande échelle. Les résultats ont démontré leur conformité avec les principes de la démarche SSbD. En parallèle\, une méthodologie combinant analyse du cycle de vie et Machine Learning (ML) a été développée afin d’étendre cette approche à une gamme plus large de nanofils d’oxydes métalliques. \nDans son ensemble\, cette thèse contribue au développement de membranes photocatalytique multifonctionnelles dédiées à la réduction et à la valorisation du CO2 ainsi qu’à la dépollution environnementale. Elle ouvre des perspectives pour le développement de procédés plus durables\, réutilisables et facilement transposables à grande échelle\, ainsi que pour l’extension de cette approche à d’autres matériaux. \n_ \nContact : deborah.verger@grenoble-inp.fr
URL:https://sfp-alpes.fr/event/soutenance-de-these-soline-beitone/
LOCATION:Phelma\, Amphi M001\, 3\, parvis Louis Néel\, Grenoble\, 38000\, France
CATEGORIES:Soutenance,Soutenance de Thèse
ORGANIZER;CN="LMGP":MAILTO:deborah.verger@grenoble-inp.fr
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260918T110000
DTEND;TZID=Europe/Paris:20260918T120000
DTSTAMP:20260910T151054Z
CREATED:20260910T151054Z
LAST-MODIFIED:20260910T151054Z
UID:10000245-1789729200-1789732800@sfp-alpes.fr
SUMMARY:Wilson POON (University of Edinburgh\, UK)
DESCRIPTION:Cooking crystalline candies and the ductile to brittle transition in concentrated suspensions\nRésumé : \nThe existence and origin of the ductile to brittle transition in non-Brownian suspensions and pastes is under-explored despite the ubiquity of such materials in practical applications. We demonstrate the phenomenon in candies of sugar crystals in a water-protein-fat matrix prepared by boiling a sugar-cream-butter mixture (known as `fudge’ in some countries). As cooking time or final cooking temperature increases\, we observe a transition from a fluid to a ductile solid\, then to a brittle solid that abruptly fractures in compression. We propose that this is driven by rising solid sugar crystal volume fraction\, and indeed find the same sequence of behaviour in a suspension of non-Brownian calcite particles as the solid fraction moves from frictional jamming to random close packing. Particle-based simulations reveal the sensitivity of the observed phenomenon to boundary conditions. \n_ \nContact : samantha.micciulla@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/wilson-poon-university-of-edinburgh-uk/
LOCATION:LiPhy – Salle de conférence\, LiPhy 140 avenue de la Physique\, St Martin d'Hères\, 38402\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260918T110000
DTEND;TZID=Europe/Paris:20260918T120000
DTSTAMP:20260910T150555Z
CREATED:20260910T150555Z
LAST-MODIFIED:20260910T150555Z
UID:10000244-1789729200-1789732800@sfp-alpes.fr
SUMMARY:Yuzhu WANG (LPMMC)
DESCRIPTION:Geometric excitations in topological flat bands\nLe séminaire théorie est financé par la fédération de recherche Quantalps. \nRésumé : \nGeometric excitations provide a new way of probing the internal structure of fractional quantum Hall (FQH) states beyond their more familiar topological properties. In this talk\, we will focus on a particular class of such excitations\, known as graviton modes\, and ask how their physics changes when we move from Landau levels to fractional Chern insulators (FCIs). \nWe will start with a brief introduction to the basic concepts and formalisms used to describe FQH states\, with an emphasis on the guiding center degree of freedom and its connection to quantum geometry. This will provide the background for understanding the microscopic origin of graviton modes and how they can be identified in strongly correlated topological bands. We then turn to FCIs\, where an intriguing contrast can be found. Despite the absence of continuous rotational symmetry in the underlying lattice\, both the FCI ground state and the graviton mode exhibit an emergent guiding center rotational symmetry. The excitation continuum\, however\, does not share this symmetry. This mismatch allows the graviton mode to couple much more strongly to the continuum\, giving it a much shorter lifetime than in Landau levels. We will introduce a simple microscopic model that helps explain why this happens. \nFinally\, we will discuss how the graviton mode may be enhanced and detected experimentally in moiré materials\, and what kinds of tuning strategies could make it more visible. We will also briefly discuss how this picture can be generalized beyond spin-two graviton modes to geometric excitations with higher spins and what exciting physics can be expected there. \n_ \nContact : cecile.repellin@lpmmc.cnrs.fr 
URL:https://sfp-alpes.fr/event/yuzhu-wang-lpmmc/
LOCATION:LPMMC – salle Roger Maynard (G421)\, CNRS - LPMMC 25 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
END:VEVENT
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