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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261015T140000
DTEND;TZID=Europe/Paris:20261015T150000
DTSTAMP:20260925T093019Z
CREATED:20260925T093019Z
LAST-MODIFIED:20260925T093019Z
UID:10000266-1792072800-1792076400@sfp-alpes.fr
SUMMARY:Francesca CHIODI (C2N\, Université Paris-Saclay)
DESCRIPTION:Superconducting Epitaxial Silicon – when you turn on the light\nRésumé : \nSince the discovery of BCS superconductivity in silicon by nanosecond laser ultra-doping with boron\, theoretical and experimental works have endeavored to understand what triggers and controls the superconducting phase. Indeed\, superconducting Si has great potential to develop a cryogenic electronics with the advantages of large scale integration and high reproducibility. Through the optimization of the nanosecond laser temporal profile\, we achieved an excellent control of both the electrical and structural properties of ultra-doped Si thin layers\, with state of the art maximum carrier concentration (8 at.%) in monocrystalline epilayers with few defects\, 100% dopant activation up to and above the solubility limit\, and a vertically homogeneous doping profile [1-3]. The control and improvement of the active doping is directly reflected in the control of the superconducting critical temperature Tc\, increased by 30% up to 0.9 K in this optimized setup\, and whose dependence with doping can now be modelled within BCS frame [3]. Furthermore\, we demonstrated that superconductivity is not only controlled by doping\, but also by the lattice deformation. Thus\, it is possible to tune up to 50% Tc by modifying by 1% the lattice parameter\, as shown through nanosecond laser incorporation of Ge up to 20 at.% [4]. \nThe sensitivity of superconducting silicon allows for multiple modulation ‘knobs’: for instance Tc can be tuned by doping\, allowing for the design of superconducting\, metallic or semiconducting regions in a device\, or by strain relaxation\, e.g. through localized Ge ion implantation. In addition\, the thin superconducting silicon layer can be affected by the absorption of photons either in the superconductor itself\, or in the undoped silicon underneath. The effect of light irradiation was highlighted in superconducting coplanar waveguide resonators\, whose resistivity easily matches the vacuum impedance. Due to the large disorder\, a high kinetic inductance characterizes the resonators [5]. The quasiparticle dynamics was measured when submitting the resonators to either a light or a microwave pulse\, these out-of-equilibrium measurements being also compared with the equilibrium generation-recombination noise spectral density. In addition\, work is in progress to assess the effect of visible photons on the DC response of the superconducting silicon micrometer-size lines\, where a single-photon counting mode with extremely low Dark Count Rates has been highlighted\, and whose detection mechanism is currently investigated. \n1. L. Desvignes\, et al.\, arXiv:2603.06383 (2026) ; PhD thesis\, Université Paris Saclay (2023) \n2. G. Hallais\, et al.\, Semicond. Sci.Tech. 38\, 034003 (2023) \n4. S. Nath\, et al.\, Phys. Status Solidi A\, 221: 2400313 (2024) \n5. P. Bonnet\, et al.\, Phys. Rev. Applied 17\, 034057 (2022) \n_ \nContact : florence.levy-bertrand@neel.cnrs.fr
URL:https://sfp-alpes.fr/event/francesca-chiodi-c2n-universite-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:20261015T160000
DTEND;TZID=Europe/Paris:20261015T170000
DTSTAMP:20260409T111459Z
CREATED:20260409T111456Z
LAST-MODIFIED:20260409T111459Z
UID:10000125-1792080000-1792083600@sfp-alpes.fr
SUMMARY:Christophe SALOMON
DESCRIPTION:Atomes froids et mesure précise du temps\n_ \nToutes les informations sont disponibles sur : https://indico.ijclab.in2p3.fr/event/13426/ \nContact : louis.fayard@IJCLAB.INP3.FR
URL:https://sfp-alpes.fr/event/christophe-salomon/
LOCATION:Laboratoire IJCLab – Auditorium Pierre Lehmann\, Rue Ampère\, Orsay cedex\, 91898\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261016T103000
DTEND;TZID=Europe/Paris:20261016T113000
DTSTAMP:20260918T091036Z
CREATED:20260918T091036Z
LAST-MODIFIED:20260918T091036Z
UID:10000261-1792146600-1792150200@sfp-alpes.fr
SUMMARY:Xavier RIBAS SALAMAÑA (Universitat de Girona)
DESCRIPTION:Supramolecular Nanocages as Masks for Fullerene Regiofunctionalization and Beyond\nRésumé : \nThe design of a confined cavity dictates the type of guest to be encapsulated\, and supramolecular cages are tunable scaffolds that allow the rational design of their cavities. Nowadays\, easily accessible C60 and C70 fullerene mono-adducts are mainly used in any application (1) due to the hampered accessibility to pure alternative fullerene poly-adduct derivatives. In general\, multi-adduct mixtures with uncontrolled regioselectivity (multi-isomers) are obtained\, and chromatographic purification is too costly and time-consuming. Herein\, porphyrin-based supramolecular nanocapsules (2\,3) are used as supramolecular shadow masks to tame the over-reactivity of Bingel-type cyclopropanation reactions and to have full control over the equatorial regioselectivity\nand the number of additions. Furthermore\, the regioselectivity control is finely tuned using a three-shell Matryoshka-like assembly towards synthesizing a single trans-3 bis-Bingel-C60 for the first time (4). Also\, the mask strategy is extended to C60 and C70 for Bingel and Diels-Alder (5\,6). We envision that the described protocol will produce a plethora of derivatives for applications such as solar cells. We will also discuss our recent selective purification of fullertube mixtures and beyond (7\,8). \nReferences :\n1. E. Castro\, L. Echegoyen et al. J. Mater. Chem. C\, 2018\, 6\, 2635.\n2. C. García-Simón\, X. Ribas\, et al. Nat. Commun. 2014\, 5:5557.\n3. C. Fuertes-Espinosa\, X. Ribas\, et al\, Chem 2020\, 6\, 169–186.\n4. E. Ubasart\, X. Ribas\, et al\, Nat. Chem. 2021\, 13\, 420-427.\n5. V. Iannace\, X. Ribas et al\, J. Am. Chem. Soc. 2024\, 146\, 5186−5194.\n6. T. Pèlachs\, X. Ribas et al\, CCS Chem. 2025\, 7\, 703–715\n7. V. Iannace\, X. Ribas et al\, J. Am. Chem. Soc. 2025\, 147\, 36079−36084\n8. V. Iannace\, X. Ribas\, Acc. Chem. Res. 2026\, 59\, 1414−1425 \n_ \nContact : noemie.lalaoui@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/xavier-ribas-salamana-universitat-de-girona/
LOCATION:DCM – Salle C209\, DCM - Bât Chimie Recherche 301 rue de la Chimie\, St Martin d'Hères\, 38400\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261016T111500
DTEND;TZID=Europe/Paris:20261016T121500
DTSTAMP:20260918T092550Z
CREATED:20260918T092501Z
LAST-MODIFIED:20260918T092550Z
UID:10000262-1792149300-1792152900@sfp-alpes.fr
SUMMARY:Gyorgy SZALOKI (Université Paul Sabatier – Toulouse)
DESCRIPTION:Towards confined gold catalysis\nRésumé : \nGold complexes have been the subject of an intense research over the past decade.[1] The main driving force to this interest is to impart new reactivity to these complexes\, that can be leveraged in catalysis. In addition to the widely used ligand engineering strategy\,[2] the concept of confining gold complexes within supramolecular cages has also shown a great\npotential.[3] Toste et coll. have demonstrated\, that small cationic gold complexes (LAu+\, L = Me3P)\, generated within anionic cages show a markedly different reactivity compared to their non-confined analogues. However\, the small cavity size of the cage (251 Å3) has not allowed to extend this concept to larger complexes (L = tBuP\, NHC) and substrates. Indeed\, one obstacle\nto overcome is the synthesis of large anionic cages\, that is far from being straightforward.\nIn order to design and synthesize large anionic cages\, we have implemented a rational approach combining modellizations and cavity size calculations.[4] As a result\, we have prepared an anionic\, cyclotricatechylene based supramolecular cage 1 with a large cavity (558 Å3).[5] Recently\, we have been studying the host-guest chemistry of this cage\, in order to prepare the confined gold-catalyst (Au+@1\, Figure 1). The catalytic activity of Au+@1 is being studied\, with special attention to the synthetically challenging gold catalyzed macrocyclizations. \nFigure 1. Concept: Using the confinement effect to alter the reactivity of gold complexes. \nAcknowledgements\nThe CNRS\, the ANR and the French Ministry of Higher Education and Research is gratefully acknowledged for funding. \nReferences\n[1] L. Rochigiani\, M. Bochmann Chem. Rev. 2021\, 121\, 8364.\n[2] J. Rodriguez\, G. Szalóki\, E. D. Sosa Carizzo\, N. Saffon-Merceron\, K. Miqueu\, D. Bourissou Angew. Chem. Int. Ed.\, 2020\, 59\, 1511;\n(b) G. Szalóki\, J. Babinot\, V. Martin-Diaconescu\, S. Mallet-Ladeira\, Y. Garcia-Rodeja\, K. Miqueu\, D. Bourissou Chem. Sci. 2022\, 13\, 10499.\n[3] M. Morimoto\, S. M. Bierschenk\, K. T. Xia\, R. G. Bergman\, K. N. Raymond\, D. F. Toste Nat. Catal. 2020\, 3\, 969.\n[4] J. V. S. Guerra\, L. F. G. Alves\, D. Bourissou\, P. S. Lopes-de-Oliveira\, G. Szalóki J. Chem. Inf. Model. 2023\, 63\, 3772.\n[5] Y. Diack\, S. Mallet-Ladeira\, D. Lesage\, J. V. S. Guerra\, D. Bourissou\, G. Szalóki Chem. Commun. 2025\, 61\, 8003 \n_ \nContact : noemie.lalaoui@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/gyorgy-szaloki-universite-paul-sabatier-toulouse/
LOCATION:DCM – Salle C209\, DCM - Bât Chimie Recherche 301 rue de la Chimie\, St Martin d'Hères\, 38400\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261026T140000
DTEND;TZID=Europe/Paris:20261026T150000
DTSTAMP:20260911T134555Z
CREATED:20260911T134555Z
LAST-MODIFIED:20260911T134555Z
UID:10000253-1793023200-1793026800@sfp-alpes.fr
SUMMARY:Ramón RIAL (Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS)\, Departamento de Física Aplicada\, Universidade de Santiago de Compostela\, Spain)
DESCRIPTION:Dynamic Supramolecular Eutectogels with Reversible Light Driven Reconfiguration\nRésumé : \nDeep eutectic solvents (DESs) constitute a highly tunable class of liquid media formed by the association of two or more components (e.g.\, a hydrogen-bond donor and an organic salt)\, whose extensive hydrogen bonding interactions result in a pronounced depression of the melting point. Their composition-dependent physicochemical properties make DESs particularly attractive for directing the self-assembly of functional soft materials [1\,2]. In this context\, eutectogels (gels formed within DES media)\, offer a versatile platform in which solvent–solute interactions can be exploited to modulate macroscopic material properties beyond those dictated by the gelator alone [3]. \nHerein\, we report a versatile strategy for the design of light-responsive eutectogels with intrinsically tunable mechanical properties. The approach relies on the supramolecular co-assembly of an amphiphilic component with a rationally designed azobenzene derivative engineered for high solubility in water-free DES media. Through complementary characterization across molecular and mesoscale length scales\, we provided a detailed understanding of the heterotypic interactions underlying the formation of elongated\, one-dimensional supramolecular networks. We further establish that photoisomerization of the azobenzene units induces pronounced rearrangements of these networks\, providing a molecular-level mechanism for controlling the material’s hierarchical organization. \nUpon ultraviolet irradiation\, this molecular reconfiguration leads to an abrupt gel-to-sol transition\, effectively erasing the material’s solid-like mechanical response. Subsequent exposure to visible light reverses the process\, restoring the gel state and recovering a mechanically robust network that remains stable during prolonged storage without appreciable loss of performance. Remarkably\, the optically driven transition is highly reversible and cyclable\, enabling repeated switching between gel and sol states without detectable deterioration of structural integrity or mechanical properties. Collectively\, these results demonstrate how molecular photochemical events can be translated into reversible macroscopic mechanical actuation\, establishing DES-based supramolecular eutectogels as promising platforms for dynamically reconfigurable soft matter. \nReferences :\n[1] Hansen\, B. et al.\, Chem. Rev. 2021\, 101\, 1232-1285.\n[2] P. A. Mercadal\, A. González\, A. Beloqui\, L. C. Tomé\, D. Mecerreyes\, M. Calderón and M. L. Picchio\, JACS Au\, 2024\, 4\, 3744-3758.\n[3] A. Sanchez-Fernandez\, J. F. Poon\, A. E. Leung\, S. F. Prevost and C. Dicko\, ACS Nano\, 2024\, 18\, 18314-18326. \nOrsolya Czakkel (College 9 Secretary) \nExternal visitors may ask for a site access to : tellier@ill.fr \nZoom link : https://ill.zoom.us/j/93326326401?pwd=mq7JqMLctpkqw7hIcPWTq6QGt8nGOg.1 – Password : SeminarC3 \n 
URL:https://sfp-alpes.fr/event/ramon-rial-centro-singular-de-investigacion-en-quimica-bioloxica-e-materiais-moleculares-ciqus-departamento-de-fisica-aplicada-universidade-de-santiago-de-compostela-spain/
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:20261105T160000
DTEND;TZID=Europe/Paris:20261105T170000
DTSTAMP:20260723T165405Z
CREATED:20260723T163914Z
LAST-MODIFIED:20260723T165405Z
UID:10000219-1793894400-1793898000@sfp-alpes.fr
SUMMARY:Guillaume HEBRARD
DESCRIPTION:Extraordinaires planètes extrasolaires\n_ \nToutes les informations sont disponibles sur : https://indico.ijclab.in2p3.fr/event/13798/ \nContact : louis.fayard@IJCLAB.INP3.FR
URL:https://sfp-alpes.fr/event/guillaume-hebrard/
LOCATION:Laboratoire IJCLab – Auditorium Pierre Lehmann\, Rue Ampère\, Orsay cedex\, 91898\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261216T123000
DTEND;TZID=Europe/Paris:20261216T133000
DTSTAMP:20260723T165459Z
CREATED:20260723T165117Z
LAST-MODIFIED:20260723T165459Z
UID:10000220-1797424200-1797427800@sfp-alpes.fr
SUMMARY:Roland LEHOUCQ
DESCRIPTION:Science-fiction : le monde de la (dé)mesure\n_ \nToutes les informations sont disponibles sur : https://indico.ijclab.in2p3.fr/event/13626/ \nContact : louis.fayard@IJCLAB.INP3.FR
URL:https://sfp-alpes.fr/event/roland-lehoucq/
LOCATION:Université Paris-Saclay – Bâtiment 625 (Hbar) – Amphi A1\, Rue Joliot Curie\, Orsay\, 91400\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20270114T160000
DTEND;TZID=Europe/Paris:20270114T170000
DTSTAMP:20260723T165928Z
CREATED:20260723T165928Z
LAST-MODIFIED:20260723T165928Z
UID:10000221-1799942400-1799946000@sfp-alpes.fr
SUMMARY:Emilia ROBIN
DESCRIPTION:Comment on a construit Orsay\n_ \nToutes les informations sont disponibles sur : https://indico.ijclab.in2p3.fr/event/13925/ \nContact : louis.fayard@IJCLAB.INP3.FR
URL:https://sfp-alpes.fr/event/emilia-robin/
LOCATION:Laboratoire IJCLab – Auditorium Pierre Lehmann\, Rue Ampère\, Orsay cedex\, 91898\, France
CATEGORIES:Séminaire
END:VEVENT
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