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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260206T110000
DTEND;TZID=Europe/Paris:20260206T120000
DTSTAMP:20260404T162116
CREATED:20260124T035020Z
LAST-MODIFIED:20260130T140553Z
UID:10000029-1770375600-1770379200@sfp-alpes.fr
SUMMARY:Kei YAMAMOTO (Advanced Science Research Center\, Japan)
DESCRIPTION:Spin-wave spectrum in a ferromagnetic disk\nAbstract : \nAngular momentum transfer in all forms contributes to the loss of information carried by dynamical spin polarisations and constitutes an important fundamental problem in spintronics. In this talk\, we present a detailed microwave spectrum measurement of magnetic excitations in an Yttrium Iron Garnet disk\, and how one can make sense of the multitudes of spectral lines and their magnetic field dependence theoretically. We explain how the axial symmetry of the setup leads to labelling of modes in terms of the conserved total angular momentum of the spin waves\, The frequency spectrum in the saturated state is compared to analytical solutions for pure exchange as well as pure dipolar models under certain limits where different types of spectral degeneracy occur. The experimental result shows splittings of those degenerate modes\, and we discuss possible interpretations in relation to angular momentum transfer between its different forms.\n​​\nMore information :https://www.spintec.fr/seminar-spin-wave-spectrum-in-a-ferromagnetic-disk/​​​\n​\nVisioconference :https://univ-grenoble-alpes-fr.zoom.us/j/98769867024?pwd=dXNnT3RMeThjYStybGVQSUN0TVdJdz09​​
URL:https://sfp-alpes.fr/event/kei-yamamoto-advanced-science-research-center-japan/
LOCATION:CEA – Salle de Séminaire IRIG (1005 – 445)\, Laboratoire Irig/Spintec\, salle de séminaire 445\, bâtiment 1005\, CEA-Grenoble\, Grenoble
CATEGORIES:Séminaire
ORGANIZER;CN="IRIG - CEA":MAILTO:odile.rossignol@cea.fr
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260206T110000
DTEND;TZID=Europe/Paris:20260206T120000
DTSTAMP:20260404T162116
CREATED:20260129T154158Z
LAST-MODIFIED:20260129T154158Z
UID:10000037-1770375600-1770379200@sfp-alpes.fr
SUMMARY:William FAUGNO (LKB / Collège de France)
DESCRIPTION:Quantum Many-Body Scars in the Presence of Density-Difference-Dependent Hopping\nRésumé : \nIt has been observed that isolated quantum systems often still produce measured values consistent with thermalization. This is unexpected due to the lack of a notion of chaos or ergodicity and the unitary dynamics of the quantum theory which is at its core linear. The conditions under which we can expect isolated quantum systems to thermalize were laid out in the eigenstate thermalization hypothesis (ETH)\, which has generally been found to hold in a variety of systems. Still\, notable violations of the ETH have been identified where a seemingly chaotic many-body quantum system exhibits some nonthermal behavior. In this talk\, I will introduce the concept of quantum many-body scars (QMBS)\, a phenomenon in which a small subset of eigenstates violates the ETH and promote nonthermal dynamics. I will then present theoretical results on a bosonic Hamiltonian with a density-dependent hopping and describe two distinct mechanisms for scar formation that arise in this model. These mechanisms provide insight into the conditions under which QMBS can be expected to occur. \nContact : serge.florens@neel.cnrs.fr
URL:https://sfp-alpes.fr/event/william-faugno-lkb-college-de-france/
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:20260206T110000
DTEND;TZID=Europe/Paris:20260206T120000
DTSTAMP:20260404T162116
CREATED:20260129T162542Z
LAST-MODIFIED:20260130T141840Z
UID:10000040-1770375600-1770379200@sfp-alpes.fr
SUMMARY:David SKURNIK (Hôpital Necker- Enfants Malades\, Université Paris Cité)
DESCRIPTION:New approaches in vaccine development\nRésumé : \nHigh-throughput sequencing and particularly original applications such as the TnSeq allow a study of host-pathogen interaction at the full genome scale through a systematic analysis off all the virulence factors of a bacteria in a particular setting. For example\, all the genes important or essential for GI tract colonization of the selected pathogenic bacteria. \nThis allows to reveal new targets for vaccine development. Interestingly\, an ongoing adaptation of the TnSeq allows the systematic identification of these antigens of interest. We call this new technology : TnVaccine. \nContact : ibs.seminaires@ibs.fr
URL:https://sfp-alpes.fr/event/david-skurnik-hopital-necker-enfants-malades-universite-paris-cite/
LOCATION:IBS – Salle des séminaires\, IBS 71 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
ORGANIZER;CN="IBS":MAILTO:ibs.seminaires@ibs
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260209T110000
DTEND;TZID=Europe/Paris:20260209T120000
DTSTAMP:20260404T162116
CREATED:20260129T155208Z
LAST-MODIFIED:20260130T142114Z
UID:10000038-1770634800-1770638400@sfp-alpes.fr
SUMMARY:Isidora ARAYA DAY (DIPC San Sebastian)
DESCRIPTION:Diagnosing higher order topological phases with electronic transport\nRésumé : \nUnlike a quantum Hall bar\, a higher-order topological insulator may not have edge modes that conduct\, but localized corner modes. These corner modes are robust to disorder and their appearance is diagnosed by a topological invariant that takes both onsite and spatial symmetries. In this talk\, I will introduce a scattering theory for detecting higher-order topological phases only from a sample’s Fermi level properties\, and will demonstrate how to apply it to different models. This theory provides an alternative approach for proving bulk–edge correspondence in intrinsic higher order topological phases\, especially in presence of disorder\, and it relies on the spectral flow that these phases show in the presence of magnetic flux. \nContact : serge.florens@neel.cnrs.fr
URL:https://sfp-alpes.fr/event/isidora-araya-day-dipc-san-sebastian/
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:20260210T103000
DTEND;TZID=Europe/Paris:20260210T113000
DTSTAMP:20260404T162116
CREATED:20260205T153331Z
LAST-MODIFIED:20260205T153331Z
UID:10000051-1770719400-1770723000@sfp-alpes.fr
SUMMARY:Stéphanie ROCCIA (LPSC-CNRS/UGA\, Grenoble)
DESCRIPTION:The search for neutron electric dipole moment at PSI\nRésumé : \nThe Universe and its history are simultaneously very well understood and still a big mystery. We have amazing tools from satellites to\nobservatories to weight the universe over its history. But the components of the Universe can simply not yet be explained by physicists. To get the full picture\, we need to identify and understand the interactions at play throughout the life of the Universe. This is the meeting point between particle physics and cosmology. At this meeting point stands the neutron\, a common particle that we can uniquely use in high precision experiments.\nI will present how experiments searching for a permanent electric dipole moment of the neutron (nEDM) aim at discovering new sources of CP violation beyond the Standard Model of particle physics and understanding the origin of the matter-antimatter asymmetry of the Universe. The quest for the neutron electric dipole moment started more than sixty years ago. In recent experiments\, polarized ultra-cold neutrons are stored in material bottles.\nI will present the ongoing efforts at the Paul Scherrer Institute in Switzerland where the n2EDM spectrometer has taken the first “physics data” in 2025. A large fraction of this dataset is dedicated to measurements of the UCN spectrum. I will present the newest UCN spectroscopy techniques that were recently published and the reasons for the importance of a deep understanding of the UCN spectrum. \n— \nHanno Filter (College 3 Secretary) \nExternal visitors may ask for a site access to tellier(at)ill.fr \nZoom link : https://ill.zoom.us/j/98964195699?pwd=vPhNT17CAeoDUr7QX4PjfyPnWsHuMU.1 – Password : SeminarC3
URL:https://sfp-alpes.fr/event/stephanie-roccia-lpsc-cnrs-uga-grenoble/
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:20260212T130000
DTEND;TZID=Europe/Paris:20260212T140000
DTSTAMP:20260404T162116
CREATED:20260124T035658Z
LAST-MODIFIED:20260129T135753Z
UID:10000030-1770901200-1770904800@sfp-alpes.fr
SUMMARY:Delphine ROPERS (Inria – Grenoble)
DESCRIPTION:Computational analyses of bacterial mRNA decay\n  \nPlus d’informations : https://bi-gre.github.io/ \nContact : lucie.lamothe@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/delphine-ropers-inria-grenoble/
LOCATION:IMAG – Salle de Réunion\, 150 place du Torrent\, St Martin d’Hères\, 38400\, France
CATEGORIES:Séminaire
ORGANIZER;CN="TIMC - IMAG":MAILTO:lucie.lamothe@univ-grenoble-alpes.fr
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260212T140000
DTEND;TZID=Europe/Paris:20260212T150000
DTSTAMP:20260404T162116
CREATED:20260130T094628Z
LAST-MODIFIED:20260130T102105Z
UID:10000042-1770904800-1770908400@sfp-alpes.fr
SUMMARY:Youngsuk KIM (Pusan National University\, Busan\, South Korea (visiting scientist @ DCM))
DESCRIPTION:Carbene–CS2 : Redox-active Radical Ligands\nContact : david.martin@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/youngsuk-kim-pusan-national-university-busan-south-korea-visiting-scientist-dcm/
LOCATION:DCM – Salle C209\, DCM - Bât Chimie Recherche 301 rue de la Chimie\, St Martin d'Hères\, 38400\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260216T110000
DTEND;TZID=Europe/Paris:20260216T120000
DTSTAMP:20260404T162116
CREATED:20260212T154413Z
LAST-MODIFIED:20260212T154413Z
UID:10000058-1771239600-1771243200@sfp-alpes.fr
SUMMARY:Roxane LESTINI & Nicolas OLIVIER (Laboratoire d'Optique et Biosciences\, Palaiseau)
DESCRIPTION:Understanding DNA replication dynamics in the archaea Haloferax volcanii\nRésumé : \nArchaea provide a simplified yet highly informative model for deciphering the complex regulatory networks governing DNA replication and origin firing. Among them\, Haloferax volcanii has a circular chromosome with four active replication origins distributed across a 3.5 Mb DNA molecule and exhibit some distinctive properties\, such as a heterogeneous polyploidy\, carrying 10–18 copies of its genome. \nHow these highly polyploid organisms regulate the activation and timing of their multiple replication origins in coordination with cell growth and division remains an open question. To address this question\, we developed a multiscale approach\, implementing the STORM technique in archaea for the first time\, Marker Frequency Analysis by sequencing (MFA-seq) to capture the global replication profile at the population level\, and fluorescence in situ hybridization (FISH) to explore ploidy variation. \nOur findings reveal\, with an unprecedented resolution of ~30 nm\, new insights into the spatial regulation of replication foci\, demonstrating their organization into clusters. We further investigated DNA replication dynamics under varying growth conditions\, revealing a reduction in replication foci number that correlates with decreased replication rates and DNA content. By contrast\, altering the replication initiation mode—by inactivating all four replication origins—does not disrupt the overall replication dynamics. \nBy integrating these techniques\, we aim to characterize the replication program in H. volcanii and gain a deeper understanding of its regulation. \nContact : delphine.debarre@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/roxane-lestini-nicolas-olivier-laboratoire-doptique-et-biosciences-palaiseau/
LOCATION:LiPhy\, Salle de Conférence\, 140 rue de la Physique\, St Martin d'Hères\, 38400
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260217T140000
DTEND;TZID=Europe/Paris:20260217T150000
DTSTAMP:20260404T162116
CREATED:20260129T161723Z
LAST-MODIFIED:20260130T142159Z
UID:10000039-1771336800-1771340400@sfp-alpes.fr
SUMMARY:Igor ROZHANSKIY (National Graphene Institute\, University of Manchester)
DESCRIPTION:Interacting spin physics in 2D : flat bands\, SOC renormalization\, and chiral textures\nRésumé : \nTwo-dimensional materials and their heterostructures offer a controllable setting where exchange\, spin-orbit coupling (SOC)\, and electron interactions shape the spin-resolved electronic structure and response. This seminar links two recent directions of my work through this common theme.\nThe first part focuses on van der Waals magnets (chromium trihalides) combined with graphene. Narrow\, spin-polarized conduction bands make these systems susceptible to charge-transfer-driven doping and strong correlations. Using DFT-calibrated effective tight-binding models\, I will show how flat-band features and longer-range hopping processes determine the low-energy spectrum and favor regimes with heavy\, strongly interacting carriers.\n​ The second part addresses many-body renormalization of SOC in monolayer transition metal dichalcogenides. Exchange effects can enhance the conduction-band spin-orbit splitting in a density-dependent manner. I will outline ​the underlying mechanism and discuss how it can be inferred from gated transport and quantum-oscillation measurements\, including multilayer configurations where valley structure and interlayer coupling provide additional diagnostics.\nA short outlook will touch on chiral spin textures\, such as skyrmions\, and how real-space chirality can contribute to transverse signals\, emphasizing possible connections and open questions for 2D material platforms. \nhttps://www.cea.fr/drf/irig/Pages/Animation-scientifique/seminaires/2026_Rozhanskiy.aspx \nContact : admin.spintec@cea.fr
URL:https://sfp-alpes.fr/event/igor-rozhanskiy-national-graphene-institute-university-of-manchester/
LOCATION:CEA – Salle de Séminaire IRIG (1005 – 445)\, Laboratoire Irig/Spintec\, salle de séminaire 445\, bâtiment 1005\, CEA-Grenoble\, Grenoble
CATEGORIES:Séminaire
ORGANIZER;CN="IRIG - CEA":MAILTO:odile.rossignol@cea.fr
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260217T140000
DTEND;TZID=Europe/Paris:20260217T150000
DTSTAMP:20260404T162116
CREATED:20260205T161137Z
LAST-MODIFIED:20260205T161544Z
UID:10000053-1771336800-1771340400@sfp-alpes.fr
SUMMARY:Anton POTOCNIK (IMEC\, Belgium)
DESCRIPTION:High-coherence foundry-compatible superconducting qubit platform\nRésumé : \nThe field of superconducting qubit technology has experienced rapid development over the past two decades. Recent advancements in the fabrication\, control and measurement of superconducting quantum devices have enabled integration of hundreds of qubits on a single chip. However\, the path towards larger-scale integration of thousands of qubits on a chip remains unclear. This talk presents imec’s platform for scalable superconducting qubit fabrication\, which is based on foundry-compatible thin film processing 1 and overlay Josephson-junction fabrication 2. The platform enables all-optical superconducting transmon qubit fabrication on 300 mm wafers\, achieving near state-of-the-art coherence times\, record-low aging and comparable Josephson junction variability to standard shadow-evaporation technique 3. A key focus of this presentation will be the understanding and mitigation of microwave losses induced by various fabricaiton steps such as Ar-milling 4 and oxide removal 6\,7 and materials such as -Ta 5 or ultra-high-resistivity silicon. The talk will conclude with an outline of ongoing efforts toward large-scale qubit characterization and control using cryo-CMOS electronics operating near qubits at the mixing-chamber plate of a dilution refrigerator 8. \n1 Mongillo\, et al.\, IEDM (2022). \n2 Verjauw et al.\, npj Quantum Information 8\, 93 (2022). \n3 Van Damme\, et al.\, Nature\, 634\, 74 (2024). \n4 Van Damme\, et al.\, PRA 20\, 014034 (2023). \n5 Lozano\, et al. Mater. Quantum. Technol. 4\, 025801 (2024). \n6 Verjauw\, et al.\, PRA 16\, 014018 (2021). \n7 Lozano\, et al.\, Advanced Science 12\, e09244 (2025). \n8 Acharya\, et al.\, Nature Electronics\, 6\, 900 (2023). \n_ \nContact : equipe-seminaires-nano@listes.grenoble.cnrs.fr
URL:https://sfp-alpes.fr/event/anton-potocnik-imec-belgium/
LOCATION:CNRS – Salle Rémy Lemaire (K223)\, CNRS - Institut Néel 25 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260217T140000
DTEND;TZID=Europe/Paris:20260217T150000
DTSTAMP:20260404T162116
CREATED:20260206T091214Z
LAST-MODIFIED:20260206T091214Z
UID:10000054-1771336800-1771340400@sfp-alpes.fr
SUMMARY:Francesco ROSA (Politecnico di Milano\, Italy)
DESCRIPTION:Magnetic and orbital properties of infinite-layer nickelate and cuprate superconductors\nRésumé : \nInfinite-layer (IL) nickelates recently gained strong interest thanks to their apparent analogies with cuprates\, including a square lattice-based structure dominated by superexchange antiferromagnetic interaction and the emergence of superconductivity upon hole doping. X-ray spectroscopies with synchrotron light are a very powerful tool for the investigation of such systems\, providing complementary information to the more traditional inelastic neutron scattering. In this seminar\, we discuss some of the recent results obtained by our group using both Resonant Inelastic X-ray Scattering (RIXS) and X-ray Magnetic Circular Dichroism (XMCD)\, mainly focusing on magnetism. RIXS results concern the analysis of dynamic spin excitations (magnons/paramagnons)\, investigating the effect of hole-doping on them and providing an estimate for the magnetic exchange coupling constants. Results on IL nickelates will be compared to analogous ones on cuprates\, highlighting analogies and differences. XMCD analysis is devoted to the static spin order in IL nickelates\, reporting the presence of a field induced out-of-plane Ni1+ spin moment. Based on magnetic field- and temperature-dependent measurements\, we justify our observations with an out-of-plane canting of in-plane anti-ferromagnetically correlated Ni1+ spins\, tentatively attributed to a symmetry lowering of the NiO2 planes. \n_ \nContact : andrew.fefferman@neel.cnrs.fr
URL:https://sfp-alpes.fr/event/francesco-rosa-politecnico-di-milano-italy/
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:20260219T113000
DTEND;TZID=Europe/Paris:20260219T123000
DTSTAMP:20260404T162116
CREATED:20260212T155849Z
LAST-MODIFIED:20260212T155849Z
UID:10000059-1771500600-1771504200@sfp-alpes.fr
SUMMARY:Sharlen MOORE (Johns Hopkins University\, Baltimore\, USA)
DESCRIPTION:Revealing abrupt transitions from goal-directed to habitual behavior\nRésumé : \nA fundamental tenet of animal behavior is that decision-making involves multiple ‘controllers.’ Initially\, behavior is goal-directed\, driven by desired outcomes\, shifting later to habitual control\, where cues trigger actions independent of the motivational state. Clark Hull’s question from 1943 still resonates today: “Is this transition [to habit] abrupt\, or is it gradual and progressive?” Despite a century-long belief in gradual transitions\, this question remains unanswered as current methods cannot disambiguate goal-directed versus habitual control in real time. Here\, we introduce a novel ‘volitional engagement’ approach\, motivating animals by palatability rather than biological need. Providing less palatable water in the home cage reduced motivation to ‘work’ for plain water in an auditory discrimination task compared to water-restricted animals. Using quantitative behavior and computational modeling\, we found that palatability-driven animals learned to discriminate as quickly as water-restricted animals but exhibited state-like fluctuations when responding to the reward-predicting cue-reflecting goal-directed behavior. After thousands of trials\, these fluctuations spontaneously and abruptly ceased\, with animals always responding to the reward-predicting cue. In line with habitual control\, post- transition behavior displayed motor automaticity\, decreased error sensitivity (assessed via pupillary responses)\, and insensitivity to sensory-specific outcome devaluation. Bilateral lesions of the habit-related dorsolateral striatum (DLS) blocked transitions to habitual behavior. Finally\, we used bilateral fiber photometry in the putative controllers of goal-directed (dorsomedial striatum\, DMS) and habitual (DLS) behavior to monitor the evolution of neural activity across learning. Both the DMS and DLS exhibited learning- related signatures in cue\, lick\, and outcome-related signaling at similar timescales in parallel. Immediately after transitioning to habitual behavior\, outcome-related signaling was suppressed in the DLS and\, to a lesser extent\, in the DMS\, while cue-evoked responses further sharpened. This abrupt shift (reduction in outcome signaling and sharpening of cue-evoked responses) suggests that sensory cues rather than outcomes drive habitual responding. Our results demonstrate that both controllers (DMS and DLS) exhibit learning-related plasticity in parallel but that the behavioral manifestation of habits emerges spontaneously and abruptly in a DLS-dependent manner\, suggesting the involvement of a higher-level process that arbitrates between the two. \nContact : robin.magnard@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/sharlen-moore-johns-hopkins-university-baltimore-usa/
LOCATION:GIN – Amphi Serge Kampf\, Grenoble Institut des Neurosciences (GIN) Bât. Edmond J. Safra\, Chemin Fortune Ferrini CHU\, La Tronche\, 38700\, France
CATEGORIES:Séminaire
ORGANIZER;CN="GIN":MAILTO:yves.goldberg@univ-grenoble-alpes.fr
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260220T110000
DTEND;TZID=Europe/Paris:20260220T120000
DTSTAMP:20260404T162116
CREATED:20260212T160617Z
LAST-MODIFIED:20260212T160617Z
UID:10000060-1771585200-1771588800@sfp-alpes.fr
SUMMARY:Dmitri KHVESHCHENKO (University of North Carolina)
DESCRIPTION:Applied Hall-o-graphy with no strings attached\nRésumé : \nThis discussion aims at ascertaining the true status of the so-called applied-holographic approach to strongly correlated quantum matter. The latter ranges from ‘not even wrong’ for the constructions based on the ad hoc ‘AdS/CMT’ to ‘might be right\, albeit for the wrong reason’ for those emerging in the context of phase-space bosonization and the related ‘Hall-o-graphic’ hydrodynamics.The presentation will be made accessible to the wide audience of non-experts and students. \nContact : serge.florens@neel.cnrs.fr
URL:https://sfp-alpes.fr/event/dmitri-khveshchenko-university-of-north-carolina/
LOCATION:LPMMC\, CNRS - Bat G\, salle Roger Maynard G-421\, Grenoble
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260220T123000
DTEND;TZID=Europe/Paris:20260220T131500
DTSTAMP:20260404T162116
CREATED:20260130T161408Z
LAST-MODIFIED:20260130T162429Z
UID:10000049-1771590600-1771593300@sfp-alpes.fr
SUMMARY:Mourad CHABBI (docteur en sciences politiques\, GEM / « Géopolitique ») & Ludivine CALAMEL (professeur Senior en sciences de gestion\, GEM)
DESCRIPTION:L’impact du contexte géopolitique sur l’évolution des règles et du marché des semi-conducteurs\nRésumé : \nCette conférence s’intéresse à la manière dont le contexte géopolitique impacte les organisations\, et notamment certaines gravitant dans le domaine de la micro-électronique (semi-conducteurs). \nContact : giant.campus@cea.fr
URL:https://sfp-alpes.fr/event/mourad-chabbi-docteur-en-sciences-politiques-gem-geopolitique-ludivine-calamel-professeur-senior-en-sciences-de-gestion-gem/
LOCATION:Amphi Minatec\, 3 parvis Louis Néel\, Grenoble\, 38054\, France
CATEGORIES:Séminaire
ORGANIZER;CN="GIANT":MAILTO:giant.campus@cea.fr
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260224T183000
DTEND;TZID=Europe/Paris:20260224T183000
DTSTAMP:20260404T162116
CREATED:20260222T085804Z
LAST-MODIFIED:20260222T090042Z
UID:10000072-1771957800-1771957800@sfp-alpes.fr
SUMMARY:Sophie Abby (TIMC\, Grenoble)
DESCRIPTION:Le premier souffle : comment les microbes ont oxygéné la Terre\nRésumé :  \nCette soirée explore la diversité du vivant à travers l’arbre phylogénétique\, en s’appuyant sur les travaux du projet Quinevol qui étudie les quinones\, molécules essentielles présentes dans tous les organismes vivants. Comment les organismes primitifs respiraient-ils avant l’apparition de l’oxygène ? Comment se sont-ils ensuite adaptés à ce qui était alors un véritable poison ? Un voyage scientifique des origines de la vie jusqu’aux frontières de la recherche actuelle. \n 
URL:https://sfp-alpes.fr/event/sophie-abby-timc-grenoble/
LOCATION:Museum de Grenoble\, 1 Rue Dolomieu\, Grenoble\, 38000\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260226T130000
DTEND;TZID=Europe/Paris:20260226T140000
DTSTAMP:20260404T162116
CREATED:20260130T162946Z
LAST-MODIFIED:20260213T084606Z
UID:10000050-1772110800-1772114400@sfp-alpes.fr
SUMMARY:Céline SCORNAVACCA (ISEM – Montpellier)
DESCRIPTION:A New Algorithm for Computing the Likelihood of a Phylogeny\nContact : lucie.lamothe@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/celine-scornavacca-isem-montpellier/
LOCATION:IMAG – Salle de Réunion\, 150 place du Torrent\, St Martin d’Hères\, 38400\, France
CATEGORIES:Séminaire
ORGANIZER;CN="TIMC - IMAG":MAILTO:lucie.lamothe@univ-grenoble-alpes.fr
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260226T140000
DTEND;TZID=Europe/Paris:20260226T150000
DTSTAMP:20260404T162116
CREATED:20260130T095731Z
LAST-MODIFIED:20260130T102010Z
UID:10000043-1772114400-1772118000@sfp-alpes.fr
SUMMARY:Paulo Henrique MACIEL BUZZETTI (Département de Chimie Moléculaire\, équipe I2BM (nouvel entrant))
DESCRIPTION:From Bio-analytics & Bio-energy : A Journey Through Functional Interfaces & Supramolecular Architectures\nContact : quentin.laurent@univ-grenoble-alpes.fr 
URL:https://sfp-alpes.fr/event/paulo-henrique-maciel-buzzetti-departement-de-chimie-moleculaire-equipe-i2bm-nouvel-entrant/
LOCATION:DCM – Salle C209\, DCM - Bât Chimie Recherche 301 rue de la Chimie\, St Martin d'Hères\, 38400\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260226T140000
DTEND;TZID=Europe/Paris:20260226T150000
DTSTAMP:20260404T162116
CREATED:20260130T101313Z
LAST-MODIFIED:20260130T101624Z
UID:10000044-1772114400-1772118000@sfp-alpes.fr
SUMMARY:Rolf LORTZ (CNRS-LNCMI\, Grenoble)
DESCRIPTION:High temperatures superconductivity with giant pressure effect in 3D networks of boron doped ultra-thin carbon nanotubes in the pores of ZSM-5 zeolite\nRésumé : \nWe report the fabrication of three‑dimensional\, interconnected networks of ultrathin carbon nanotubes (CNTs) embedded within the ~5 Å pores of zeolite ZSM‑5 crystals using a controlled chemical vapour deposition (CVD) process. Confinement within these sub‑nanometre channels yields CNTs with strongly one‑dimensional electronic characteristics\, including pronounced van Hove singularities in the density of states. By introducing boron dopants during growth\, we strategically tune the Fermi level toward a van Hove singularity\, as supported by ab initio electronic‑structure calculations. This electronic tuning\, combined with the intrinsic 3D connectivity of the CNT–zeolite framework\, enables a dimensional crossover from 1D electronic states to a phase‑coherent\, bulk superconducting state.\nTo establish the presence of superconductivity\, we employ five complementary experimental probes—electrical resistivity\, ac susceptibility\, dc magnetization\, specific heat\, and point‑contact spectroscopy. All measurements consistently indicate a superconducting transition at ambient pressure with a critical temperature Tc in the range of 220–250 K. Simultaneous resistivity and ac‑susceptibility measurements reveal a three‑order‑of‑magnitude drop in resistance accompanied by the onset of a robust Meissner effect with nearly perfect diamagnetic screening. Point‑contact spectroscopy further uncovers a multigap superconducting state\, with a dominant gap of approximately 30 meV\, in reasonable agreement with expectations from Bardeen–Cooper–Schrieffer (BCS) theory. The differential conductance spectra exhibit clear particle–hole symmetry and evolve smoothly between the tunnelling and Andreev reflection regimes as the contact transparency is varied—behaviour uniquely characteristic of superconducting quasiparticles. Specific‑heat measurements show a distinct anomaly at the transition\, reminiscent of signatures observed in high‑Tc cuprate superconductors.\nFinally\, we find that the application of very modest external pressure further enhances the superconducting transition temperature\, pushing Tc above ambient temperature and suggesting that the system remains far from its optimal tuning point. These results collectively point to a new pathway for achieving high‑temperature superconductivity in engineered low‑dimensional carbon‑based materials. \nContact : florence.levy-bertrand@neel.cnrs.fr
URL:https://sfp-alpes.fr/event/rolf-lortz-cnrs-lncmi-grenoble/
LOCATION:CNRS – Salle Rémy Lemaire (K223)\, CNRS - Institut Néel 25 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260227T110000
DTEND;TZID=Europe/Paris:20260227T120000
DTSTAMP:20260404T162116
CREATED:20260129T163105Z
LAST-MODIFIED:20260130T142401Z
UID:10000041-1772190000-1772193600@sfp-alpes.fr
SUMMARY:Jean-Francois COLLET (Institut de Duve\, Bruxelles)
DESCRIPTION:How (and Why) do Gram-Negative Bacteria build an Outer Membrane\nRésumé :  \nGram-negative bacteria are defined by a complex cell envelope in which the outer membrane plays a central role in protection\, nutrient exchange\, and antibiotic resistance. This asymmetric lipid bilayer forms a robust permeability barrier\, yet its biogenesis presents a striking challenge : all outer membrane components are synthesized in the cytoplasm or at the inner membrane and must be transported and assembled across the periplasm without direct energy input. In this talk\, I will discuss how Gram-negative bacteria build their outer membrane and why this process is essential for cellular physiology. I will introduce the major pathways responsible for outer membrane assembly and highlight how their activities need to be coordinated to maintain envelope integrity. I will also present recent work showing that the outer membrane is not merely a passive barrier\, but a mechanically active structure that enables the buildup of periplasmic pressure\, a property critical for envelope stability and bacterial survival. Together\, these findings underscore the outer membrane as a dynamic\, multifunctional organelle and a promising target for future antibacterial strategies. \nContact : ibs.seminaires@ibs.fr
URL:https://sfp-alpes.fr/event/jean-francois-collet-institut-de-duve-bruxelles/
LOCATION:IBS – Salle des séminaires\, IBS 71 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
ORGANIZER;CN="IBS":MAILTO:ibs.seminaires@ibs
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260302T110000
DTEND;TZID=Europe/Paris:20260302T120000
DTSTAMP:20260404T162116
CREATED:20260227T094612Z
LAST-MODIFIED:20260227T094814Z
UID:10000077-1772449200-1772452800@sfp-alpes.fr
SUMMARY:Moritz SENGER (Université d’Uppsala\, Département de chimie pour les sciences de la vie\, Suède)
DESCRIPTION:From Catalysis to Sensing : Proton Transfer in [FeFe]-hydrogenases\nRésumé : \nEnzymes are natures catalysts enabling challenging reactions at ambient conditions and at low overpotentials. In particular\, [FeFe]-hydrogenases which catalyse bidirectional H2 turnover (2e- + 2H+ <-> H2) at high turnover numbers raise interest for their application in a green hydrogen economy. In [FeFe]-hydrogenases catalysis takes place at a unique diiron cofactor that is equipped with carbon monoxide (CO) and cyanide (CN) ligands. They serve as intrinsic infrared active probes sensitive to redox changes located directly at the centre of the catalytic reaction. This in isolation inactive di-iron cofactor becomes efficient H2 catalyst when incorporated into the [FeFe]-hydrogenase protein scaffold. More recently H2 sensing [FeFe]-hydrogenases have been characterised using the identical cofactor but for H2 sensing. The fundamental design principles of the protein scaffolds to selectively tune cofactor function either to efficient H2 catalyst or to H2 sensor remain unknown.Here we use organic dyes to artificially activate catalytic [1-2] and sensory [3-5] [FeFe]-hydrogenases photochemically and investigate them via in situ ATR-FTIR spectroscopy. Following changes of the cofactor CO and CN ligands\, single carboxylic acid residues and collective amide I modes\, we show that protein scaffold differences are not limited to the cofactor second coordination sphere but extend through the whole protein via proton transfer pathways\, secondary structure changes and most likely dimerization events. More general\, our results give a first idea how protein scaffolds can tune cofactor functions. \nReferences :[1] M. Senger\, V. Eichmann\, K. Laun\, J. Duan\, F. Wittkamp\, G. Knor\, U. P. Apfel\, T. Happe\, M. Winkler\, J. Heberle and S. T. Stripp*J Am Chem Soc\, 2019\, 141\, 17394-17403.[2] M. Lorenzi\, M. T. Gamache\, H. J. Redman\, H. Land\, M. Senger* and G. Berggren*ACS Sustain Chem Eng\, 2022\, 10\, 10760-10767.[3] I. Voloshyn\, C. Schumann\, P. R. Cabotaje\, A. Zamader\, H. Land and M. Senger*Chem Commun (Camb)\, 2024\, 60\, 10914-10917[4] M. Senger*\, C. Schumann\, P. R. Cabotaje\, A. Zamader\, P. Huang\, H. Land and G. Berggren*Phys Chem Chem Phys\, 2025\, 27 (18)\, 9864-9875 [5] Cabotaje\, P. R. ; Sekretareva\, A. ; Senger\, M. ; Huang\, P. ; Walter\, K. ; Redman\, H. J. ; Croy\, N. ; Stripp\, S. T. ; Land\, H. ; Berggren\, G.J Am Chem Soc 2025\, 147 (5)\, 4654-4666. \nContact : ibs.seminaires@ibs.fr
URL:https://sfp-alpes.fr/event/moritz-senger-universite-duppsala-departement-de-chimie-pour-les-sciences-de-la-vie-suede/
LOCATION:IBS – Salle des séminaires\, IBS 71 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
ORGANIZER;CN="IBS":MAILTO:ibs.seminaires@ibs
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260302T110000
DTEND;TZID=Europe/Paris:20260302T120000
DTSTAMP:20260404T162116
CREATED:20260227T102022Z
LAST-MODIFIED:20260227T102040Z
UID:10000083-1772449200-1772452800@sfp-alpes.fr
SUMMARY:Matteo MILANI (ESPCI Paris)
DESCRIPTION:Rheofluidics: single-drop oscillatory rheology with microfluidics\nRésumé : \nThe measurement of frequency-dependent viscoelastic moduli is of paramount importance in many fields\, from material science to biology\, and is typically accomplished in bulk materials using commercial rheometers. The trend towards miniaturization in the biotechnology\, manufacturing and chemical processing industries has motivated the extension of viscoelastic measurements to microscopic objects with well-defined shape and size such as droplets\, vesicles\, microcapsules\, or even single cells. For instance\, local mechanical probes such as AFM nanoindentation can be used to probe single-cell stiffness\, and micropipette aspiration probes the interfacial properties of droplets and vesicles. Despite their versatility\, these techniques are characterized by complex deformation geometries and a relatively low throughput\, which makes them unfit to sample highly heterogeneous populations such as those typical of biological samples. To this end\, novel microfluidic approaches have been recently developed to measure the stiffness of cells and droplets flowing through narrow channels. These approaches are well-suited for applications requiring a high throughput\, but they lack the fine control of stress and strain required by quantitative mechanical measurements. Here\, we present a novel technique called Rheofluidics\, which combines the high throughput of microfluidics with the versatility of traditional rheological probes. Like a stress-controlled rheometer\, Rheofluidics measures the time-dependent deformation of droplets subject to a well-defined hydrodynamic stress\, whose time evolution is controlled by the shape of the microfluidic channel in which the droplets are flowing. To validate this approach and to demonstrate the power of this technique\, we study the linear and nonlinear rheology of oil droplets\, hydrogel beads and lipid vesicles\, extracting their viscoelastic properties with a throughput more than 1000 times higher than that of standard rheology. \nContact : gwennou.coupier@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/matteo-milani-espci-paris/
LOCATION:LiPhy\, Salle de Conférence\, 140 rue de la Physique\, St Martin d'Hères\, 38400
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260302T140000
DTEND;TZID=Europe/Paris:20260302T150000
DTSTAMP:20260404T162116
CREATED:20260206T095950Z
LAST-MODIFIED:20260206T095958Z
UID:10000056-1772460000-1772463600@sfp-alpes.fr
SUMMARY:Ran TAO  (Institut Néel)
DESCRIPTION:Magnetic excitations in LuFe2Ge2\nRésumé : \nThe iron-based superconductor YFe2Ge2 (Tc ~ 1.8 K)[1] has attracted interest due to strong electronic correlations[2] and shows enhanced magnetic fluctuations in neutron scattering[3]. Its isoelectronic and isostructural sister compound LuFe2Ge2 orders antiferromagnetically below TN ~ 6.8 K\, and in clean crystals shows a resistive superconducting transition below 1 K. We present recent inelastic neutron scattering experiments on LuFe2Ge2 in the ordered and paramagnetic phases. The excitations are modelled with linear spin wave theory\, and we note some similarities to previous results in paramagnetic YFe2Ge2. \n[1] J. Chen et al.\, Phys. Rev. Lett. 125\, 237002 (2020).\n[2] J. Baglo et al. Phys. Rev. Lett. 129\, 046402 (2022). B. Xu et al.\, Proc. Natl. Acad. Sci. U. S. A. 121\, e2401430121 (2024).\n[3] H. Wo et al.\, Phys. Rev. Lett. 122\, 217003 (2019). \n_ \nContact : andrew.fefferman@neel.cnrs.fr
URL:https://sfp-alpes.fr/event/ran-tao-institut-neel/
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:20260303T140000
DTEND;TZID=Europe/Paris:20260303T140000
DTSTAMP:20260404T162116
CREATED:20260227T153207Z
LAST-MODIFIED:20260227T153207Z
UID:10000089-1772546400-1772546400@sfp-alpes.fr
SUMMARY:Marco MACCARINI (chercheur UGA)
DESCRIPTION:Exploring the Nanostructure of Biomimetic Membranes\nRésumé : \nModel lipid membranes are simplified yet powerful systems that mimic key features of biological plasma membranes—the essential envelopes that define and protect living cells. Their controlled simplicity makes them ideal for precise experimental techniques\, enabling us to explore their interactions with novel nanoengineered materials. \nWhen combined with biological components like proteins\, these membranes not only deepen our understanding of fundamental biological processes but also serve as building blocks for advanced nanoengineered materials with tailored technological applications. \nIn this seminar\, I will present examples from my research\, where laboratory techniques\, large-scale facility analyses\, and computational methods converge to provide in-depth characterization and mechanistic insights into membrane behavior. These findings hold significant potential for advancements in health\, biotechnology\, and fundamental biology. \nShort Bio/CV\nAs  a CNRS Chargé de Recherche\, I’ve recently joined the LMGP to continue my research journey in this scientific new environment. My academic path has taken me across borders—starting with a Physics degree in Italy\, followed by a PhD in Polymer Physics in England\, and postdoctoral experiences in Germany and Canada. Along the way\, I’ve had the privilege of working at world-class facilities like the Institut Laue Langevin\, where I deepened my expertise in large-scale scientific infrastructure. I now continue this work at LMGP\, where my research focuses on the intersection of physics\, materials science\, and biomimetic systems. \nContact : deborah.verger@grenoble-inp.fr
URL:https://sfp-alpes.fr/event/marco-maccarini-chercheur-uga/
LOCATION:LMGP – salle des séminaires\, Grenoble INP -Phelma 3 parvis Louis Néel\, Grenoble\, 38054\, France
CATEGORIES:Séminaire
ORGANIZER;CN="LMGP":MAILTO:deborah.verger@grenoble-inp.fr
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260305T113000
DTEND;TZID=Europe/Paris:20260305T123000
DTSTAMP:20260404T162116
CREATED:20260227T134443Z
LAST-MODIFIED:20260227T134815Z
UID:10000084-1772710200-1772713800@sfp-alpes.fr
SUMMARY:Viviana RICON MONTES & Andreas OFFENHÄUSSER (Forschungszentrum Jülich\, Allemagne)
DESCRIPTION:Devices that interact with the brain: from nanostructured to flexible electrodes\nRésumé : \nNeural electrodes are the core components of neuroelectronic devices\, enabling the recording and simulation of neural activity. Our research focuses on two primary areas : (1) the design and\ncharacterization of the neuron-electrode interface\, and (2) the development of flexible neural interfaces for both in vivo and in vitro applications. Microelectrode arrays (MEAs) are commonly used to bridge the interface between neurons and electronic systems. However\, current MEAs face limita7ons in signal fidelity\, precision of neural modulation\, and long-term biocompatibility. To address these challenges\, we are developing nanomaterial-based MEAs that offer enhanced physical and chemical properties\, leading to improved cell-electrode coupling. Specifically\, we have engineered a hybrid structure combining vertical nanostraws with nanocavities\, enabling stable\, non-invasive\, and long-term recording at sub-threshold resolution. \nImplantable neural prosthetic devices provide direct access to local neural circuits and are critical components of brain-machine interfaces. While current clinical-grade devices—typically based on silicon or noble metals—have driven significant advances\, they oPen fail to sustain reliable neural communication over extended periods. Our goal is to create next-generation neurotechnologies that integrate seamlessly with biological tissue\, supporting multimodal neural interrogation through electrical\, optical\, or chemical means. We are actively exploring novel device architectures\, materials\, and implantation strategies\, alongside rigorous performance evaluation\, with the ultimate aim of enabling both acute and chronic in vivo applications. Our approach combines thin-film technology and surface micromachining processes with additive manufacturing techniques\, including two-photon lithography. These are integrated with self-\naligned\, template-assisted electrodeposition processes\, kirigami-inspired designs with matched-die forming\, novel bonding methods\, and the modular stacking of two-dimensional neural probes with key-lock systems. These technologies support versatile applications\, ranging from investigating seizure-like activity in in vitro epilepsy models to advancing visual prosthesis that enable bidirectional communication along the visual pathway. \nContact : clement.hebert@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/viviana-ricon-montes-andreas-offenhausser-forschungszentrum-julich-allemagne/
LOCATION:GIN – Amphi Serge Kampf\, Grenoble Institut des Neurosciences (GIN) Bât. Edmond J. Safra\, Chemin Fortune Ferrini CHU\, La Tronche\, 38700\, France
CATEGORIES:Séminaire
ORGANIZER;CN="GIN":MAILTO:yves.goldberg@univ-grenoble-alpes.fr
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260305T140000
DTEND;TZID=Europe/Paris:20260305T150000
DTSTAMP:20260404T162116
CREATED:20260213T084049Z
LAST-MODIFIED:20260213T084159Z
UID:10000062-1772719200-1772722800@sfp-alpes.fr
SUMMARY:Dalila BOUNOUA (LLB)
DESCRIPTION:Polarized Neutrons Reveal Altermagnetism in MnF2\nRésumé : \nAltermagnets constitute a recently identified class of collinear\, magnetically compensated materials in which oppositely oriented magnetic sublattices cannot be mapped onto each other  another by a primitive lattice translation or inversion operation. Unlike conventional antiferromagnets\, altermagnets break time-reversal symmetry. These distinctive symmetry properties give rise to spin-split electronic bands and chirality-split magnon branches\, both exhibiting characteristic anisotropic patterns in momentum space\, even in the absence of relativistic spin-orbit coupling [1].\nExperimental evidence for spin-split electronic bands has been reported in materials such as MnTe and CrSb using angle-resolved photoemission spectroscopy (ARPES) [2\,3]\, while resonant inelastic X-ray scattering (RIXS) has revealed chiral magnon excitations in CrSb [4]. Polarized neutron scattering\, however\, provides a unique probe of altermagnetism\, as it enables a direct characterization of spin-wave excitations and allows both split magnons [5-7] and their associated chirality [8-10] to be measured simultaneously.\nIn this work\, we investigated the chirality-split magnon spectrum of MnF₂ [9] using polarized inelastic neutron scattering (INS). Our measurements reveal\, for the first time in MnF₂\, a small but clearly resolvable splitting of the magnon branches\, primarily driven by long-range dipolar interactions. Polarization analysis on a magnetically domain-biased sample further uncovers a finite chiral contribution to the neutron scattering cross section\, which reverses sign between the two split magnon modes. These observations provide direct spectroscopic evidence of altermagnetism in MnF₂. \n[1] G. L. Smejkal et al.\, Phys. Rev. X 12\, 040501 (2022).\n[2] J. Krempasky\, et al.\, Nature 626\, 517–522 (2024).\n[3] S. Reimers et al.\, Nat. Comm 15\, 2116 (2024)\, G. Yang et al. Nat Commun 16\, 1442 (2025).\n[4] N. Biniskos et al.\, Nat Commun 16\, 9311 (2025).\n[5] Z. Liu Phys. Rev. Lett. 133\, 156702 (2024).\n[6] Q. Sun et al.\, Phys. Rev. Lett. 135\, 18 (2025).\n[7] A. K. Singh et al.\, arXiv:2511.16086.\n[8] P. A. McClarty et al.\, Phys. Rev. B 111\, L060405 (2025).\n[9] Q. Faure at al.\, arXiv:2509.07087 (under review).\n[10]  J. Sears et al.\, arXiv:2601.04303v1 \n \nContact : elsa.lhotel@neel.cnrs.fr
URL:https://sfp-alpes.fr/event/dalila-bounoua-llb/
LOCATION:CNRS – Salle Rémy Lemaire (K223)\, CNRS - Institut Néel 25 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260306T110000
DTEND;TZID=Europe/Paris:20260306T120000
DTSTAMP:20260404T162116
CREATED:20260227T090909Z
LAST-MODIFIED:20260227T091022Z
UID:10000076-1772794800-1772798400@sfp-alpes.fr
SUMMARY:Kilian FRABOULET (Max Planck Institute Stuttgart)
DESCRIPTION:Competing orders in many-electron systems: a renormalization group perspective\nRésumé :  \nThe renormalization group is an established approach to study quantum many-body systems\, and this applies especially to one of its modern implementations known as the functional renormalization group (fRG). In particular\, the fRG constitutes a flexible and unbiased tool for the study of competing orders. In this talk\, I will outline recent progress in this direction for correlated electron systems. To this end\, I will first discuss the competition between antiferromagnetism\, charge density waves and superconductivity in the 2D Hubbard model\, thus making a connection with high-temperature superconductors. The special role of bosonization methods will be emphasized along the way. I will also show how the fRG can be combined with dynamical mean-field theory to treat strongly interacting regimes\, with a focus on d-wave superconductivity. As a next step\, I will increase the complexity of the model by including non-local interactions and discuss unconventional superconductivity in an extended Hubbard model with a connection to moiré materials. Special consideration will also be given to the treatment of retarded interactions with electron-phonon couplings. Finally\, I will highlight recent fRG studies of quantum criticality in Dirac materials\, with a connection to graphene. \nContact : serge.florens@neel.cnrs.fr
URL:https://sfp-alpes.fr/event/kilian-fraboulet-max-planck-institute-stuttgart/
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:20260306T140000
DTEND;TZID=Europe/Paris:20260306T150000
DTSTAMP:20260404T162116
CREATED:20260305T145615Z
LAST-MODIFIED:20260305T145620Z
UID:10000093-1772805600-1772809200@sfp-alpes.fr
SUMMARY:Carlo PIFFERI (Centre de Biophysique Moléculaire\, Orléans)
DESCRIPTION:Exploiting disulfide-rich peptides as protein epitope mimics : development of a generalizable conjugation approach for immunogen preparation\nRésumé : \nGeneration of specific antibodies against peptides by immunization requires their covalent conjugation to protein carriers to override their inherently weak immunogenicity. The vast majority of bioconjugation approaches to achieve peptide-protein constructs rely on thiol-maleimide chemistry1 and capitalize on a wide array of commercial maleimide-functionalized protein carriers. Disulfide-rich peptides2 (DRPs) possess a rigid\, constrained structure that makes them ideal for designing synthetic mimics of protein regions/domains. For bioconjugation purposes\, the introduction of a single spare thiol moiety into a linear peptide antigen is straightforward\, while DRPs’ disulfide bonds are prone to intramolecular thiophilic attack by the reactive thiolate. This unintended reactivity competes with the desired Michael addition to the maleimide moiety\, ultimately disrupting the native disulfide bridging framework. As a result\, DRP’s tertiary structure will be altered\, affording an immunogen that is a poor mimic of the native target. Although a few studies have explored the late-stage introduction of thiol-containing cross-linkers onto DRP antigens for their conjugation onto protein carriers\,3\,4 the stability of DRP’s disulfide pattern in the presence of an extra thiol has never been examined. To address this\, we systematically evaluated the influence of different spacers in “DRP-spacer-thiol” constructs\, under thiol-maleimide reaction conditions.5 Our results highlight how both linker length and flexibility are key to maintain DRP disulfides unaltered\, providing a general approach to achieve DRP bioconjugation by thiol-maleimide chemistry. We have applied our approach to a small DRP predicted to closely mimic a surface-accessible epitope of the full LINGO-1 protein\, and obtained a very specific antibody response upon immunization: the resulting polyclonal IgG was able to selectively bind the full-length protein in a cellular context\, with stringent selectivity across its four homologs. \nReferences : \n1. M. Góngora-Benítez\, J. Tulla-Puche & F. Albericio\, Chem. Rev. 2014\, 114\, 901–926.\n2. K. Renault\, J. W. Fredy\, P.-Y. Renard & C. Sabot\, Bioconjug. Chem. 2018\, 29\, 2497–2513.\n3. H. Katayama & M. Mita\, Bioorganic Med. Chem. 2016\, 24\, 3596–3602.\n4. H. Katayama\, R. Mizuno & M. Mita\, Biosci. Biotechnol. Biochem. 2019\, 83\, 1791–1799.\n5. L. Azzoug et al.\, ChemRxiv 2025\, DOI:10.26434/chemrxiv-2025-krjcm \n_ \nContact : david.goyard@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/carlo-pifferi-centre-de-biophysique-moleculaire-orleans/
LOCATION:DCM – Salle C209\, DCM - Bât Chimie Recherche 301 rue de la Chimie\, St Martin d'Hères\, 38400\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260309T140000
DTEND;TZID=Europe/Paris:20260309T150000
DTSTAMP:20260404T162116
CREATED:20260213T084947Z
LAST-MODIFIED:20260213T084947Z
UID:10000063-1773064800-1773068400@sfp-alpes.fr
SUMMARY:Marek BARTKOWIAK (Paul Scherrer Institut)
DESCRIPTION:Spin-orbit control of antiferromagnetic domains without a Zeeman coupling\nRésumé : \nEncoding information in antiferromagnetic (AFM) domains is a promising solution for the ever growing demand in magnetic storage capacity. The absence of a macroscopic magnetization avoids crosstalk between different domain states\, enabling ultrahigh density spintronics while being detrimental to the domain detection and manipulation. Disentangling these merits and disadvantages seemed so far unattainable. We report evidence for a new AFM domain selection mechanism based on non Zeeman susceptibility anisotropy induced by the relative orientation of external magnetic fields to the k-domains. Consequently\, the charge transport response is controlled by the rotation of the magnetic field and a pronounced anisotropic magnetoresistance is found in the AFM phase of bulk materials Nd$_{1−x}$Ce$_x$xCoIn$_5$. Our results and the domain switching theory indicate that this constitutes a new effect which might be universal across multiband materials. It provides a novel mechanism to control and detect AFM domains\, opening new perspectives for AFM sprintronics. \nContact : andrew.fefferman@neel.cnrs.fr
URL:https://sfp-alpes.fr/event/marek-bartkowiak-paul-scherrer-institut/
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:20260310T140000
DTEND;TZID=Europe/Paris:20260310T150000
DTSTAMP:20260404T162116
CREATED:20260226T163942Z
LAST-MODIFIED:20260226T163953Z
UID:10000074-1773151200-1773154800@sfp-alpes.fr
SUMMARY:François PARMENTIER (Laboratoire de physique de l'école normale supérieure)
DESCRIPTION:Quantized heat flow in the Hofstadter butterfly\nRésumé : \nWhen subjected to a strong magnetic field\, electrons on a two-dimensional lattice acquire a fractal energy spectrum called Hofstadter’s butterfly. In addition to its unique recursive structure\, the Hofstadter butterfly is intimately linked to non-trivial topological orders\, hosting a cascade of ground states characterized by non-zero topological invariants. These states\, called Chern insulators\, are usually understood as replicas of the ground states of the quantum Hall effect\, with electrical and thermal conductances that should be quantized\, reflecting their topological order. The Hofstadter butterfly is now commonly observed in van-der-Waals heterostructures-based moiré superlattices. However\, its thermal properties\, particularly the quantized heat flow expected in the Chern insulators\, have not been investigated\, potentially questioning their similarity with standard quantum Hall states. Here we probe the heat transport properties of the Hofstadter butterfly\, obtained in a graphene / hexagonal boron nitride moiré superlattice. We observe a quantized heat flow\, uniquely set by the topological invariant\, for all investigated states of the Hofstadter butterfly: quantum Hall states\, Chern insulators\, and even symmetry-broken Chern insulators emerging from strong electronic interactions. Our work firmly establishes the universality of the quantization of heat transport and its intimate link with topology. A. Zhang\, et al.\, arXiv:2601.05694 (2026) \nContact : equipe-seminaires-nano@listes.grenoble.cnrs.fr
URL:https://sfp-alpes.fr/event/francois-parmentier-laboratoire-de-physique-de-lecole-normale-superieure/
LOCATION:CNRS – Salle Rémy Lemaire (K223)\, CNRS - Institut Néel 25 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
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DTSTART;TZID=Europe/Paris:20260311T110000
DTEND;TZID=Europe/Paris:20260311T120000
DTSTAMP:20260404T162116
CREATED:20260305T143839Z
LAST-MODIFIED:20260305T143844Z
UID:10000092-1773226800-1773230400@sfp-alpes.fr
SUMMARY:Tymoteusz TULA (LPMMC\, CNRS\, Grenoble)
DESCRIPTION:One-to-one correspondence between two-point correlators and entanglement in magnetic systems\nRésumé : \nThere are multiple measures of multipartite entanglement — including entanglement in thermal mixtures — currently used to study many-body interacting systems. Recently\, Quantum Fisher Information has been proposed as a multipartite entanglement measure that can be connected to experimentally accessible observables. In this talk\, I will present our recent findings about a one-to-one correspondence between two-point correlators and a certain general class of Heisenberg-like Hamiltonians and wavefunctions. This is a foundation of our claim that a mapping from finite-temperature observables to any entanglement measure exists for such systems. Furthermore\, I will present our results of training a convolutional neural network (CNN) to recognize and predict the entanglement for one-dimensional anisotropic XY and XYZ models\, which exhibit an entanglement transition. From our preliminary results we found that entanglement can be accurately predicted by a CNN using both static and dynamical correlators\, even when the network is trained on only a fraction of the full dataset or on data from a different system than the one used for prediction. Specifically\, when trained on observables from an anisotropic XY model\, accurate predictions can be achieved using only about 3% (6%) of the data when employing dynamical two-point correlators (structure factors) for learning. \nContact : pierre.nataf@lpmmc.cnrs.fr
URL:https://sfp-alpes.fr/event/tymoteusz-tula-lpmmc-cnrs-grenoble/
LOCATION:LPMMC – salle Roger Maynard (G421)\, CNRS - LPMMC 25 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
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