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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260302T140000
DTEND;TZID=Europe/Paris:20260302T150000
DTSTAMP:20260404T150002
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:20260404T150002
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:20260404T150002
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:20260404T150002
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:20260404T150002
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:20260404T150002
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:20260404T150002
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:20260404T150002
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:20260404T150002
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:20260404T150002
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:20260404T150002
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:20260404T150002
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:20260404T150002
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:20260404T150002
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:20260404T150002
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
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DTSTART;TZID=Europe/Paris:20260331T140000
DTEND;TZID=Europe/Paris:20260331T150000
DTSTAMP:20260404T150002
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
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DTSTART;TZID=Europe/Paris:20260401T140000
DTEND;TZID=Europe/Paris:20260401T160000
DTSTAMP:20260404T150002
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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