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X-ORIGINAL-URL:https://sfp-alpes.fr
X-WR-CALDESC:Évènements pour SFP Alpes
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261021T110000
DTEND;TZID=Europe/Paris:20261021T120000
DTSTAMP:20261015T132750Z
CREATED:20261015T132750Z
LAST-MODIFIED:20261015T132750Z
UID:10000305-1792580400-1792584000@sfp-alpes.fr
SUMMARY:Vadim PLASTOVETS (University of Augsburg)
DESCRIPTION:Cavity-controlled superconductivity : interplay of matter and photonic fluctuations\nRésumé : \nConfining electromagnetic fields in a cavity reshapes the photonic environment of a superconductor\, providing a tunable control of its superfluid stiffness. We show that the sign of this effect depends qualitatively on the underlying superconducting regime. In conventional low-temperature BCS superconductors\, cavity-photon-mediated electron-electron interactions renormalize the kinetic mass of Cooper pairs\, leading to a reduction of effective superfluid density near critical temperature. In contrast\, in phase-fluctuating two-dimensional superconductors (such as underdoped cuprates)\, the cavity reshapes the collective plasma mode and can thereby suppress thermally excited phase fluctuations\, effectively enhancing the superfluid stiffness. These theoretical findings provide a possible explanation for recent experimental observations in niobium- and cuprate-based systems. \n_ \nContact : pierre.nataf@lpmmc.cnrs.fr
URL:https://sfp-alpes.fr/event/vadim-plastovets-university-of-augsburg/
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:20261022T140000
DTEND;TZID=Europe/Paris:20261022T160000
DTSTAMP:20260925T154712Z
CREATED:20260925T154505Z
LAST-MODIFIED:20260925T154712Z
UID:10000273-1792677600-1792684800@sfp-alpes.fr
SUMMARY:Soutenance de Thèse par Lucie RIVET (CEA-Irig/SyMMES)
DESCRIPTION:Synthèse et caractérisation de polymères d’accepteurs non fullerène stables pour des cellules solaires « tout polymère »\nRésumé : \nAu cours des cinq dernières années\, les cellules solaires organiques (CSO) ont montré une forte progression de leurs performances dépassant 20% de rendement photovoltaïque en 2022. La formulation de ces deux matériaux sous forme d’encre imprimable rend possible l’industrialisation de ce procédé sur des substrats flexibles et par des techniques d’impression à haute vitesse. La bascule vers l’industrialisation à grande échelle est proche mais il reste à s’affranchir de plusieurs verrous technologiques importants. Parmi les approches permettant d’augmenter la stabilité des couches actives\, le remplacement des petites molécules acceptrices appelée accepteurs non fullerène par leurs dérivés polymères a récemment attiré notre attention. Ils présentent plusieurs avantages : une grande facilité de formulation sous forme d’encres solubles dans des solvants non halogénés\, une nano-morphologie robuste permettant une stabilité à long terme et l’accession a des couches plus épaisses grâce au mélange de deux polymères.​​​​​
URL:https://sfp-alpes.fr/event/soutenance-de-these-par-lucie-rivet-cea-irig-symmes/
LOCATION:Basilique du Sacré Cœur – salle de conférence\, 4 rue Emile Gueymard\, Grenoble\, 38000\, France
CATEGORIES:Soutenance,Soutenance de Thèse
ORGANIZER;CN="IRIG - CEA":MAILTO:irig.communication@cea.fr
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261023T093000
DTEND;TZID=Europe/Paris:20261023T113000
DTSTAMP:20261002T134425Z
CREATED:20261002T092006Z
LAST-MODIFIED:20261002T134425Z
UID:10000283-1792747800-1792755000@sfp-alpes.fr
SUMMARY:Soutenance de thèse par Tanisha BADHAURIA
DESCRIPTION:Étude des effets électromécaniques dans des nanofils semi-conducteurs piézoélectriques\nRésumé : \nZinc oxide (ZnO) nanowire (NWs) are promising materials for nanoelectromechanical systems (NEMS) and piezoelectric energy harvesting due to their coupled piezoelectric\, semiconducting nature and compatibility with low temperature synthesis methods. Theoretically\, ultra-thin ZnO NWs are expected to show a substantial increase in the piezoelectric response\, but their experimental fabrication and integration into functional devices still present difficulties. This thesis explores the effects of NW geometry\, d efect chemistry and device architecture on the electromechanical response of hydrothermally grown ZnO NWs. Two device architectures are developed for advanced nanoscale characterization\, including individual laterally contacted NW devices and vertically integrated Piezoelectric energy generators (PEGs). We report the first successful integration of electrically functional devices \nand (PEGs) with vertically aligned ultra-thin ZnO NWs of diameter about 20 nm for the experimental study of their piezoelectric behaviour. The systematic post-growth treatments like oxygen annealing\, vacuum annealing and oxygen plasma exposure are investigated by XRD\, FESEM\, PL\, XPS\, KPFM\, s-MIM and PFM. An oxygen annealing at 500° C showed that the free-carrier screening is reduced and increases the effective piezoelectric coefficient from 5.3 pm/V to 6.2 pm/V\, a 17% enhancement\, while \, preserving the NW morphology. Combining the size reduction of ZnO NWs to ultra-thin with oxygen annealing result in a synergistic enhancement of the piezoelectric performance. The oxygen annealed PEGs fabricated from 20-nm-diameter and 1-μm-long ZnO NWs showed a maximum output voltage of 134 mV under the applied force of at 1N\, which is an enhancement of about 306% compared to the devices based on the thicker (~80 nm) NWs which was 33mV. The results directly link the dimensions\, defect chemistry\, and electromechanical response\, showing that combining diameter engineering and defect engineering is an effective strategy for optimizing ZnO-basedpiezoelectric devices for future self-powered sensors and energy harvesting applications. \n_ \nContact : deborah.verger@grenoble-inp.fr
URL:https://sfp-alpes.fr/event/soutenance-de-these-par-tanisha-badhauria/
LOCATION:Phelma Minatec\, Z104\, 3\, parvis Louis Néel\, Grenoble\, 38000\, France
CATEGORIES:Soutenance,Soutenance de Thèse
ORGANIZER;CN="LMGP":MAILTO:deborah.verger@grenoble-inp.fr
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261026T080000
DTEND;TZID=Europe/Paris:20261030T140000
DTSTAMP:20260626T085105Z
CREATED:20260424T140407Z
LAST-MODIFIED:20260626T085105Z
UID:10000136-1793001600-1793368800@sfp-alpes.fr
SUMMARY:Journées de la Matière Condensée (JMC 2026)
DESCRIPTION:Ces journées rassemblent la communauté scientifiques autour des thématiques relevant de la matière condensée\, des concepts aux applications. Le succès de ces journées en fait l’un des plus grand congrès de Physique en France et l’une des plus grandes rencontres de la physique de la Matière Condensée en Europe. \nLa soumission des résumés est ouverte et le restera jusqu’à fin mai. \nNous vous encourageons à vous inscrire dès l’ouverture afin de : \n\nbénéficier du tarif préférentiel\,\ngarantir votre participation\,\nfaciliter l’organisation scientifique et logistique.\n\nToutes les informations pratiques (programme préliminaire\, conférencier·es invités\, modalités d’inscription\, hébergement) sont régulièrement mis à jour sur le site de la conférence (Journées de la Matière Condensée 2026 – Sciencesconf.org) \nNous espérons vous retrouver nombreuses et nombreux pour cette nouvelle édition des JMC ! \n\n—— \n\n\nWe are pleased to announce the Journées de la matière condensée JMC 2026 (Condensed Matter Days 2026)\, which will be held from 26 to 30 October in Toulouse. \nThis conference brings together the scientific community to discuss topics related to condensed matter\, from concepts to applications. The success of this conference makes it one of the largest physics conferences in France and one of the largest gatherings of condensed matter physicists in Europe. \nAbstract submission is open and will remain so until the end of May. \nWe encourage you to register as soon as possible in order to benefit from the preferential rate\, guarantee your participation\, facilitate scientific and logistical organisation. \nAll practical information (preliminary programme\, guest speakers\, registration details\, accommodation) is available on the conference website: Journées de la Matière Condensée 2026 – Sciencesconf.org \n\n\n\nWe hope to see many of you at this new edition of the JMC !
URL:https://sfp-alpes.fr/event/journees-de-la-matiere-condensee-jmc-2026/
LOCATION:Université de Toulouse – Auditorium Marthe Condat\, 118\, route de Narbonne\, Toulouse\, 31400\, France
CATEGORIES:Conférence,Evènements
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