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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260206T103000
DTEND;TZID=Europe/Paris:20260206T123000
DTSTAMP:20260404T223836
CREATED:20260124T034725Z
LAST-MODIFIED:20260130T141434Z
UID:10000028-1770373800-1770381000@sfp-alpes.fr
SUMMARY:Doru C. LUPASCU (Institute for Materials Science and CENIDE - Faculty of Engineering\, University of Duisburg-Essen)
DESCRIPTION:Hyperfine Interactions as a Probe in Solids : The Example of a Multiferroic System : Bismuth Ferrite\nHyperfine interactions denote the coupling of the wave functions of nuclear states to the electronic shell of the atom. This coupling is a correction term to the energy of a nuclear state and equally so in reverse manner for the electronic shell of the atom. \nLike nuclear magnetic resonance or Mössbaer spectroscopy\, the nuclear perturbed gamma-gamma-angular correlation spectroscopy (PAC) investigates this energetic modification of the nuclear state. For sufficiently high nuclear spin value\, magnetic interactions as well as quadrupole interactions become accessible. The beauty of the method is its highly local character in the crystal lattice. It directly monitors fields at a particular lattice or defect site. Similar is true for molecules. \nBismuth ferrite is a perovskite crystal exhibiting magnetic and electric ordering phenomena. It is antiferromagnetic and a very good ferroelectric. We used several probe atoms that offer suitable nuclear gamma-gamma cascades to understand these two ordering phenomena in the identical crystal and their coupling. Different from the long term belief\, we proved that there is no magnetoelectric coupling in this crystal.\nThe presentation will introduce the measurement method\, and the material system and display how it can be used to investigate solids in a very local manner. \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/doru-c-lupascu-institute-for-materials-science-and-cenide-faculty-of-engineering-university-of-duisburg-essen/
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:20260206T110000
DTEND;TZID=Europe/Paris:20260206T120000
DTSTAMP:20260404T223836
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:20260404T223836
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:20260209T110000
DTEND;TZID=Europe/Paris:20260209T120000
DTSTAMP:20260404T223836
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:20260404T223836
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:20260216T110000
DTEND;TZID=Europe/Paris:20260216T120000
DTSTAMP:20260404T223836
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:20260404T223836
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:20260217T140000
DTEND;TZID=Europe/Paris:20260217T150000
DTSTAMP:20260404T223836
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:20260404T223836
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:20260220T110000
DTEND;TZID=Europe/Paris:20260220T120000
DTSTAMP:20260404T223836
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:20260226T140000
DTEND;TZID=Europe/Paris:20260226T150000
DTSTAMP:20260404T223837
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:20260302T110000
DTEND;TZID=Europe/Paris:20260302T120000
DTSTAMP:20260404T223837
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:20260404T223837
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:20260305T140000
DTEND;TZID=Europe/Paris:20260305T150000
DTSTAMP:20260404T223837
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:20260404T223837
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:20260309T140000
DTEND;TZID=Europe/Paris:20260309T150000
DTSTAMP:20260404T223837
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:20260310T000000
DTEND;TZID=Europe/Paris:20260313T235959
DTSTAMP:20260404T223837
CREATED:20260324T041304Z
LAST-MODIFIED:20260124T041637Z
UID:10000032-1773100800-1773446399@sfp-alpes.fr
SUMMARY:Synergies in High Resolution Spectroscopy workshop (HIRES2026)
DESCRIPTION:The workshop will bring together researchers in the fields of neutron spin-echo\, backscattering\, and time-of-flight (TOF) spectroscopy. It aims to highlight the strengths and synergies of these techniques\, while also showcasing their interplay with other non-neutron-based methods. \nParticipation is not limited to neutron experts\, users of complementary techniques who wish to expand their research toward neutron scattering are also warmly welcome. \nAbstract submission deadline is 30 November 2025. \nFor full details please visit the website of the workshop: https://workshops.ill.fr/e/HIRES2026 \n  \nIf you have any questions don’t hesitate to contact the Organising Committee by e-mailing to hires@ill.fr \n 
URL:https://sfp-alpes.fr/event/synergies-in-high-resolution-spectroscopy-workshop-hires2026/
LOCATION:ILL – Salle de Séminaire (SB-036)\, ILL 71 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Workshop
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260310T083000
DTEND;TZID=Europe/Paris:20260313T120000
DTSTAMP:20260404T223837
CREATED:20260206T095155Z
LAST-MODIFIED:20260206T095155Z
UID:10000055-1773131400-1773403200@sfp-alpes.fr
SUMMARY:Synergies in High Resolution Spectroscopy workshop (HIRES2026)
DESCRIPTION:The workshop will bring together researchers in the fields of neutron spin-echo\, backscattering\, and time-of-flight (TOF) spectroscopy. It aims to highlight the strengths and synergies of these techniques\, while also showcasing their interplay with other non-neutron-based methods. \nParticipation is not limited to neutron experts\, users of complementary techniques who wish to expand their research toward neutron scattering are also warmly welcome. \nFor full details please visit the website of the workshop : https://workshops.ill.fr/e/HIRES2026 \nIf you have any questions don’t hesitate to contact the Organising Committee by e-mailing to hires@ill.fr \n_ \nContact : HIRES2026@ill.fr
URL:https://sfp-alpes.fr/event/synergies-in-high-resolution-spectroscopy-workshop-hires2026-2/
LOCATION:ILL 4\, Grenoble\, 38000\, France
CATEGORIES:Workshop
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260310T140000
DTEND;TZID=Europe/Paris:20260310T150000
DTSTAMP:20260404T223837
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
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260311T110000
DTEND;TZID=Europe/Paris:20260311T120000
DTSTAMP:20260404T223837
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
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260311T140000
DTEND;TZID=Europe/Paris:20260311T160000
DTSTAMP:20260404T223837
CREATED:20260213T091226Z
LAST-MODIFIED:20260227T150926Z
UID:10000064-1773237600-1773244800@sfp-alpes.fr
SUMMARY:Soutenance de Thèse de Subham SENAPATI (IRIG / Spintec)
DESCRIPTION:Spin-orbit torque based magnetic memories evaluation for cryogenic applications\nRésumé : \nThe rapid development of cryogenic computing platforms\, including superconducting electronics\, quantum information processors\, high-performance computing systems\, and space applications\, has created a demand for memory technologies that operate efficiently\, reliably\, and scalable at low temperatures. While magnetic random-access memory (MRAM) is a mature and commercially deployed non-volatile memory at room temperature\, its behaviour and limitations at cryogenic temperatures remain insufficiently explored\, particularly for three-terminal spin-orbit torque magnetic tunnel junctions (SOT-MTJs). This thesis presents a comprehensive experimental and modelling study of SOT-based magnetic memories operated from room temperature (300 K) down to liquid-helium (4 K) temperatures. A dedicated cryogenic characterisation framework is developed to extract magnetic parameters\, quantify switching statistics\, and evaluate write performance under both quasi-static and sub-nanosecond pulsed conditions. Temperature-dependent measurements reveal enhanced magnetic anisotropy and thermal stability at low temperatures\, accompanied by non-trivial trends in critical switching current. By combining experiments with micromagnetic simulations incorporating temperature-dependent material properties and transient Joule heating\, this work demonstrates that self-heating remains a dominant factor during write operations\, especially at cryogenic bath temperatures. Beyond conventional SOT-MRAM\, complementary approaches including optimised spin-transfer torque devices and voltage-gate-assisted SOT switching are investigated. They show that controlling retention via storage layer thickness is a relevant strategy to decrease write current while electric-field control of anisotropy enables efficient modulation of switching across a large temperature range. Overall\, this thesis establishes both the physical limitations and technological potential of SOT- and voltage-gated SOT-based MRAM as viable candidates for future cryogenic memory systems. \nhttps://www.cea.fr/drf/irig/Pages/Animation-scientifique/theses/2026_Senapati.aspx \nContact : admin.spintec@cea.fr
URL:https://sfp-alpes.fr/event/soutenance-de-these-de-subham-senapati-irig-spintec/
LOCATION:CEA – Salle de Séminaire IRIG (1005 – 445)\, Laboratoire Irig/Spintec\, salle de séminaire 445\, bâtiment 1005\, CEA-Grenoble\, Grenoble
CATEGORIES:Soutenance,Soutenance de Thèse
ORGANIZER;CN="IRIG - CEA":MAILTO:odile.rossignol@cea.fr
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260317T140000
DTEND;TZID=Europe/Paris:20260317T150000
DTSTAMP:20260404T223837
CREATED:20260227T085330Z
LAST-MODIFIED:20260227T085338Z
UID:10000075-1773756000-1773759600@sfp-alpes.fr
SUMMARY:Klaus MØLMER (Niels Bohr Institute\, University of Copenhagen)
DESCRIPTION:Quantum optics with radiation on the move\nRésumé : \nWith the scaling of quantum technologies to many separate material quantum components\, we may have to couple these systems by propagating quantum radiation\, in the form of light\, microwaves or phonons. There are\, however\, rather fundamental obstacles to the treatment of propagation of quantum radiation and its interaction with matter. These obstacles include the general multimode character of propagating fields and the duration and spatial extent of useful light and microwave pulses. The talk will review a recent theoretical approach to deal theoretically with these obstacles\, and it will present examples of new\, unforeseen\, possibilities for easy preparation and manipulation “on the fly” of quantum states of light and matter. \nCoffee and croissants will be offered after the colloquium in front of the room ! \nPersonne à contacter : Michele Filippone (michele.filippone@cea.fr)
URL:https://sfp-alpes.fr/event/klaus-molmer-niels-bohr-institute-university-of-copenhagen/
LOCATION:CNRS – Salle René Pauthenet (J229)\, CNRS – LNCMI\, 25 avenue des Martyrs\, Grenoble\, 38000\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260319T140000
DTEND;TZID=Europe/Paris:20260319T150000
DTSTAMP:20260404T223837
CREATED:20260227T145207Z
LAST-MODIFIED:20260227T145253Z
UID:10000086-1773928800-1773932400@sfp-alpes.fr
SUMMARY:Rebeca RIBEIRO (C2N\, Paris-Saclay)
DESCRIPTION:Twist-Angle-Controlled Anomalous Gating in Bilayer Graphene/BN Heterostructures\nRésumé : \nAnomalous gating effects—such as gate ineffectiveness and pronounced hysteresis—have been observed in graphene-based systems encapsulated in boron nitride (BN) and linked to a possible ferroelectric state. However\, their origin\, stability\, and reproducibility remain under debate. During this talk\, I will present charge transport experiments in dual-gated\, dynamically rotatable van der Waals heterostructures based on bilayer graphene encapsulated in BN. Remarkably\, the angular degree of freedom acts as an ON/OFF switch for the anomalous gating response. We show that the angular alignment between the two BN layers is the key parameter governing these effects. Both gate ineffectiveness and hysteresis are highly sensitive to small angular changes\, and they clearly change in behavior\, which we classify into three distinct regimes. \nContact : florence.levy-bertrand@neel.cnrs.fr
URL:https://sfp-alpes.fr/event/rebeca-ribeiro-c2n-paris-saclay/
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:20260320T133000
DTEND;TZID=Europe/Paris:20260320T143000
DTSTAMP:20260404T223837
CREATED:20260226T162747Z
LAST-MODIFIED:20260305T154053Z
UID:10000073-1774013400-1774017000@sfp-alpes.fr
SUMMARY:ATTENTION !!! Séminaire reporté. Initialement prévu le 30 mars  !!! - Bjoern WEHINGER (ESRF)
DESCRIPTION:Neutron and x-rays scattering on quantum magnets at high pressures and low temperatures\nRésumé : \nApplication of external pressure acts as clean tuning parameter of inter-atomic distances and bond angles and therefor allows for precise control of magnetic interactions in condensed matter. Extreme conditions can thus be used to stabilize novel quantum phases and drive systems close to quantum criticality where new and exciting phenomena are expected. Within this seminar I will show how recent advances in neutron and x-ray scattering allows to access fingerprints of quantum correlations and present novel results on quantum magnets at the extreme. \n_ \nArno Hiezz (College 4 Secretary) \nExternal visitors may ask for a site access to tellier(at)ill.fr \n 
URL:https://sfp-alpes.fr/event/bjoern-wehinger-esrf/
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:20260323T140000
DTEND;TZID=Europe/Paris:20260323T150000
DTSTAMP:20260404T223837
CREATED:20260306T161739Z
LAST-MODIFIED:20260306T162442Z
UID:10000098-1774274400-1774278000@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-2/
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:20260327T110000
DTEND;TZID=Europe/Paris:20260327T120000
DTSTAMP:20260404T223837
CREATED:20260320T095205Z
LAST-MODIFIED:20260320T095209Z
UID:10000102-1774609200-1774612800@sfp-alpes.fr
SUMMARY:Jacopo DE NARDIS (Cergy Paris University)
DESCRIPTION:Anticoncentration of Wave Functions and Information-Protected Phases in Noisy Quantum Chaotic Systems\nRésumé : \nI will present recent results on noisy quantum chaotic dynamics\, with a particular focus on wave-function anticoncentration—characterized\, for instance\, through bitstrings output distributions—and on Information-protected phases that persist at finite circuit depth. \nContact : serge.florens@neel.cnrs.fr
URL:https://sfp-alpes.fr/event/jacopo-de-nardis-cergy-paris-university/
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:20260330T140000
DTEND;TZID=Europe/Paris:20260330T150000
DTSTAMP:20260404T223837
CREATED:20260312T152112Z
LAST-MODIFIED:20260312T152502Z
UID:10000099-1774879200-1774882800@sfp-alpes.fr
SUMMARY:Sander VAN SMAALEN (Laboratory of Crystallography\, Bayerisches Geoinstitut\, University of Bayreuth)
DESCRIPTION:Chiral charge density waves in EuAl4 and related compounds\nRésumé : \nThe BaAl 4 structure type has centrosymmetric\, tetragonal symmetry\, I4/mmm\, with three crystallographically independent atom sites: Ba\, Al1 and Al2. Solid solution series RAl 4-x Gax (R= Eu\, Sr\, Ca\, Ba; 0 < x < 4) crystallize in this structure type [1]\, where Ga preferably occupies the Al2 site. Accordingly\, complete chemical order is found for x = 0\, 2\, 4. Incommensurate charge-density waves (CDWs) have been observed in several of these ordered compounds. For the other values of x\, lack of chemical order leads to suppression of the CDW transition. At much lower temperatures (T = 10–30 K) magnetic order appears for the compounds with magnetic Eu atoms. Here\, we present the crystal structures of the incommensurate CDWs of EuAl 4 \, EuAl 2 Ga2 and SrAl 4 . In particular\, the symmetry of the CDWs is analyzed in view of x-ray diffraction data (present data [2–5])\, and results of transmission electron microscopy (TEM)\, density functional theory (DFT) calculations and inelastic x ray scattering (IXS) from the literature [6–8].\nReferences : \n[1] M. Stavinoha et al.\, Phys. Rev. B 97\, 195146 (2018). Charge density wave behavior and order-disorder in the antiferromagnetic metallic series Eu(Ga1-x Al x )4 .\n[2] S. Ramakrishnan et al.\, IUCrJ 9\, 378–385 (2022). Orthorhombic charge density wave on the tetragonal lattice of EuAl 4 .\n[3] S. R. Kotla et al.\, Phys. Rev. B 112\, 064113 (2025). Broken inversion symmetry in the charge density wave phase in EuAl 4 .\n[4] S. Ramakrishnan et al.\, Phys. Rev. Research 6\, 023277 (2024). Non-centrosymmetric\, transverse structural modulation in SrAl 4 \, and elucidation of its origin in the BaAl 4 family of\ncompounds.\n[5] H. Agarwal et al.\, Phys. Rev. B 111\, 155144 (2025). I-centered versus F-centered orthorhombic symmetry and negative thermal expansion of the charge density wave of EuAl2 Ga2 .\n[6] H. Ni et al.\, Phys. Rev. Mater. 8\, 104414 (2024). Real-space visualization of atomic displacements in a long-wavelength charge density wave using cryogenic 4D-STEM.\n[7] A. N. Korshunov et al.\, Phys. Rev. B 110\, 045102 (2024). Phonon softening and atomic modulations in EuAl 4 .\n[8] F. Z. Yang et al.\, Nature Commun. 16\, 10401 (2025). Incommensurate Transverse Peierls Transition and Signature of Chiral Charge Density Wave in EuAl4 \nContact : andrew.fefferman@neel.cnrs.fr
URL:https://sfp-alpes.fr/event/sander-van-smaalen-laboratory-of-crystallography-bayerisches-geoinstitut-university-of-bayreuth/
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:20260331T140000
DTEND;TZID=Europe/Paris:20260331T150000
DTSTAMP:20260404T223837
CREATED:20260227T152048Z
LAST-MODIFIED:20260227T152234Z
UID:10000088-1774965600-1774969200@sfp-alpes.fr
SUMMARY:Simon PONTON (chargé de recherche CNRS - SIMaP)
DESCRIPTION:Development of the combinatorial approach for the CVD thin film deposition process : Multiphysics coupling and machine learning\nRésumé : \nThe combinatorial approach applied to chemical vapor deposition processes integrating high-throughput experiments\, computational simulations\, and machine learning seems to emerge as a transformative paradigm to accelerate the discovery of novel materials. Through systematic gradient explorations\, large-scale datasets can be generated to deepen our understanding of process-structure-property relationships. Machine learning models\, trained on experimental and simulated data enable rapid prediction and identification of high-potential solutions\, thereby guiding future experiments and simulations. The synergy not only reduces the time or cost associated with material discovery but also unlocks access to previously unexplored regions of the materials space. \nShort Bio/CVMy academic journey began in Grenoble\, where I studied chemistry before developing a keen interest in materials sciences\, particularly nanostructures and their processing. Driven by a desire to unravel the underlying mechanisms\, I started my PhD in Toulouse\, between the CIRIMAT and LGC. There\, I expanded my expertise in chemical engineering and Multiphysics simulation. After nearly two years of postdoctoral research\, I sought to broaden my research perspective and joined Polytechnique Montréal in the chemical engineering section for two postdoctoral positions that led to an associate professor role. However\, my longing for French cheese proved irresistible\, I successfully secured a position at CNRS and joined SIMaP in February 2026. \nContact : deborah.verger@grenoble-inp.fr
URL:https://sfp-alpes.fr/event/simon-ponton-charge-de-recherche-cnrs-simap/
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:20260401T140000
DTEND;TZID=Europe/Paris:20260401T160000
DTSTAMP:20260404T223837
CREATED:20260227T150400Z
LAST-MODIFIED:20260227T151333Z
UID:10000087-1775052000-1775059200@sfp-alpes.fr
SUMMARY:Soutenance de Thèse de Simon VERNIER
DESCRIPTION:Optimisation et caractérisation avancée de couches minces de zircone stabilisée à l’yttrine par dépôt chimique d’organométalliques en phase vapeur pour des cellules électrochimiques à oxydes solides\nRésumé : \nNotre consommation énergétique et l’électrification de notre production afin de la décarboner. Le développement des énergies solaire et éolienne est cependant freiné par leur défaut principal : leur intermittence. Le stockage saisonnier de l’énergie sous forme d’hydrogène est une solution prometteuse pour pallier à ce défaut. EPISTORE est un projet de recherche européen visant au développement d’une cellule électrochimique à oxydes solides (SOC)\, réversible\, en couche mince\, basse température (< 500°C). Ces dispositifs sont en effet particulièrement pertinents pour la conversion électricité-gaz. \nCette thèse\, dans le cadre d’EPISTORE\, projet du programme de recherche et d’innovation Horizon 2020\, vise au développement de couches minces de zircone stabilisée à l’yttrine (YSZ) pour servir d’électrolyte pour ces SOCs. Le YSZ\, contenant 8 mol% d’yttrine (8YSZ) est un matériau déjà largement utilisé comme électrolyte dans les dispositifs électrochimiques en céramique. Ses propriétés lui permettent de conduire efficacement les ions oxygènes tout en formant une barrière électronique. L’étude des couches minces de YSZ fabriquées au cours de cette thèse doit permettre d’évaluer la pertinence de réduire la quantité d’yttrine dans le matériau. En effet\, les travaux publiés sur le sujet suggèrent qu’une concentration de 3 mol% ou 4 mol% d’yttrine pourraient améliorer les propriétés mécaniques\, vitales pour des dispositifs en couches minces. \nCe travail détaille l’optimisation de la synthèse de ces films par dépôt chimique en phase vapeurs d’organométalliques (MOCVD) puis la caractérisation avancée de ces échantillons\, non seulement structurellement et morphologiquement (XRD\, TEM\, SEM\, Raman…) mais aussi de leurs propriétés électriques via de la spectroscopie d’impédance électrochimique (EIS) ou mécaniques via nanoindentation et tests de déformation. Une nouvelle technique d’observation directe de la diffusion ionique impliquant des traceurs isotopiques et de la spectroscopie Raman a aussi été adaptée à ce matériau pour la première fois. \nLes résultats obtenus suggèrent que l’emploi de 3YSZ et 4YSZ à basse température (< 500 °C) permettent d’obtenir des performances électrochimiques équivalentes ou supérieures au 8YSZ. Un effet positif de ce changement de concentration sur les propriétés mécaniques des films n’a cependant pas été démontré. \nContact : deborah.verger@grenoble-inp.fr
URL:https://sfp-alpes.fr/event/soutenance-de-these-de-simon-vernier/
LOCATION:Phelma minatec\, Salle Z108\, Grenoble INP - Phelma\, 3 parvis Louis Néel\, Grenoble\, 38000\, France
CATEGORIES:Soutenance,Soutenance de Thèse
ORGANIZER;CN="LMGP":MAILTO:deborah.verger@grenoble-inp.fr
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DTSTART;TZID=Europe/Paris:20260407T110000
DTEND;TZID=Europe/Paris:20260407T120000
DTSTAMP:20260404T223837
CREATED:20260320T150306Z
LAST-MODIFIED:20260320T150310Z
UID:10000105-1775559600-1775563200@sfp-alpes.fr
SUMMARY:Rajeesh KUMAR N  (Research Associate\, Experimental Physics IV – Solid State Physics\, Ruhr-Universität Bochum\, Germany)
DESCRIPTION:Magnetism and spin dynamics of a weakly interacting rare-earth stretched diamond lattice\nRésumé : \nIn condensed matter physics\, a quantum-disordered ground state is characterized by the absence of long-range order down to absolute zero temperature\, where the disorder is driven by quantum fluctuations that persist even at T=0. On the other hand\, the magnetism of rare-earth materials is particularly intriguing as it originates from their localized 4f electrons\, which exhibit strong spin–orbit coupling\, pronounced magnetic anisotropy\, and relatively weak exchange interactions between magnetic ions. These unique characteristics\, when combined with suitable lattice geometry\, can give rise to a wide variety of unconventional magnetic ground states. \nA diamond magnetic lattice is a bipartite network and in its ideal form\, does not exhibit geometric frustration. However\, “stretched” diamond lattices have recently gained attention where frustration can emerge due to competition between nearest-neighbor (J1) and next-nearest-neighbor (J2) exchange interactions\, despite preserving the bipartite nature. In this context\, we investigate the magnetic ground state of the rare-earth molybdate compound Na5Yb(MoO4)4\, which crystallizes in a stretched diamond magnetic lattice. This compound can be viewed as a complex derivative of the conventional scheelite- type ABO4 structure\, crystallizing in the tetragonal space group I41/a. The magnetic lattice in Na5Yb(MoO4)4 is highly unusual\, featuring a remarkably large nearest-neighbor Yb–Yb separation of approximately 6.3 Å\, in contrast to previously studied stretched-diamond systems where the J1 distance typically lies in the range of 3–5 Å and is predominantly governed by superexchange interactions. Furthermore\, the next-nearest-neighbor (J2) Yb–Yb distance exceeds 9 Å\, significantly weakening the J2 exchange interactions. As a result\, magnetic frustration arising from competing J1–J2 exchange is significantly suppressed in Na5Yb(MoO4)4\, distinguishing it from other frustrated diamond-lattice systems. \nWe employ neutron and synchrotron X-ray diffraction to elucidate the structural details of Na5Yb(MoO4)4. The magnetic properties and ground state are investigated using bulk magnetic susceptibility measurements\, specific heat studies\, and muon spin relaxation (μSR) experiments. In addition\, density functional theory calculations within the DFT+U framework are used to provide theoretical support for the experimental findings. Our results establish Na5Yb(MoO4)4 as a rare example of a dipolar quantum paramagnet in which single-ion physics and long-range dipolar interactions dominate\, while exchange interactions are suppressed to the millikelvin energy scale. \nReference \n1. N. D. Kelly et al.\, Physical Review Materials 6\, 044410 (2022).\n2. A. Chauhan et al.\, Physical Review B 108\, 134424 (2023).\n3. J. Kumar et al.\, Physical Review B 111\, 014411 (2025).\n4. T. Arh et al.\, Nat. Mater. 21\, 416 (2022). \n  \nCollege 5B Secretary \nAlberto Rodriguez Velamazan \nExternal visitors may ask for a site access to Brigitte Dubouloz (dubouloz@ill.fr)
URL:https://sfp-alpes.fr/event/rajeesh-kumar-n-research-associate-experimental-physics-iv-solid-state-physics-ruhr-universitat-bochum-germany/
LOCATION:ILL – Salle de Séminaire (110-111)\, ILL 50 71 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
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