BEGIN:VCALENDAR VERSION:2.0 PRODID:-//SFP Alpes - ECPv6.18.3.1//NONSGML v1.0//EN CALSCALE:GREGORIAN METHOD:PUBLISH X-WR-CALNAME:SFP Alpes X-ORIGINAL-URL:https://sfp-alpes.fr X-WR-CALDESC:Évènements pour SFP Alpes REFRESH-INTERVAL;VALUE=DURATION:PT1H X-Robots-Tag:noindex X-PUBLISHED-TTL:PT1H BEGIN:VTIMEZONE TZID:Europe/Paris BEGIN:DAYLIGHT TZOFFSETFROM:+0100 TZOFFSETTO:+0200 TZNAME:CEST DTSTART:20250330T010000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:+0200 TZOFFSETTO:+0100 TZNAME:CET DTSTART:20251026T010000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:+0100 TZOFFSETTO:+0200 TZNAME:CEST DTSTART:20260329T010000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:+0200 TZOFFSETTO:+0100 TZNAME:CET DTSTART:20261025T010000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:+0100 TZOFFSETTO:+0200 TZNAME:CEST DTSTART:20270328T010000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:+0200 TZOFFSETTO:+0100 TZNAME:CET DTSTART:20271031T010000 END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20260928T110000 DTEND;TZID=Europe/Paris:20260928T120000 DTSTAMP:20260925T163255Z CREATED:20260925T163255Z LAST-MODIFIED:20260925T163255Z UID:10000280-1790593200-1790596800@sfp-alpes.fr SUMMARY:Isabelle EISENMANN (University of Amsterdam\, the Netherlands) DESCRIPTION:Odd collective phenomena in light-driven microalgae\nRésumé : \nFor motile microalgae\, light is both a source of energy and a cue to orient in space. Their response to light can teach us about internal mechanisms\, such as photosynthesis and photoprotection. On the other hand\, physicists see them as active particles controllable by light\, and use them to explore new active matter phenomena. \nIn the first part of this talk\, I will briefly describe several collective phenomena that emerge in suspensions of swimming microalgae – mediated by shading\, hydrodynamic or chemical interactions\, and discuss the biological insights they can provide. \nI will then describe recent results on odd active matter\, using a novel experimental system of spinning microalgae. The cells self-assemble into a percolating chiral fluid as their density increases. Strikingly\, microscopic and macroscopic vorticity have opposite signs: while individual cells spin clockwise\, clusters orbit counterclockwise. Combining experiments and theory\, we show that this chirality inversion is a direct consequence of the particles’ active (i.e. internally driven) nature. We then investigate odd transport on this percolating network. These experiments show how a living chiral fluid can behave fundamentally differently from an externally driven one. \n_ \nContact : salima.rafai@univ-grenoble-alpes.fr URL:https://sfp-alpes.fr/event/isabelle-eisenmann-university-of-amsterdam-the-netherlands/ LOCATION:LiPhy – Salle de conférence\, LiPhy 140 avenue de la Physique\, St Martin d'Hères\, 38402\, France CATEGORIES:Séminaire END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20260928T133000 DTEND;TZID=Europe/Paris:20260928T153000 DTSTAMP:20260910T152347Z CREATED:20260910T152315Z LAST-MODIFIED:20260910T152347Z UID:10000247-1790602200-1790609400@sfp-alpes.fr SUMMARY:Soutenance de Thèse par Andy SEGURET DESCRIPTION:Croissance épitaxiale d’oxyde de gallium par dépôt de couches atomiques et épitaxie par jets moléculaires\nRésumé : \nUltra-wide bandgap semiconductors such as diamond\, AlN and Ga2O3 are emerging as strong contenders to beat the limits of current power electronics\, based on SiC and GaN. Ga2O3 is particularly interesting\, with its 4.9 eV bandgap\, high (> 8 MV/cm) breakdown electric field and large Baliga’s figure of merit. The growth of Ga2O3 using atomic layer deposition (ALD) and molecular beam epitaxy (MBE) remain largely unexplored\, and present interesting potential. On the one hand\, ALD\, as a self-limiting growth method\, enables sub-nm thickness control and excellent conformality\, on both flat and high-aspect-ratio structures\, making it particularly suitable for ultra-thin layers and interface engineering\, while using a low thermal budget. On the other hand\, MBE provides highly controlled growth under ultra-high vacuum conditions\, allowing for abrupt interfaces\, precise control of composition and doping\, and detailed in-situ monitoring of growth processes\, making it particularly well suited for the growth of heterostructures. In this context\, the Ga2O3/AlN heterojunction was identified as a particular target of these studies. This thesis is a contribution the development of Ga2O3-based devices for power electronics\, through the exploration of the deposition of Ga2O3 thin films by ALD and MBE. The fabrication of efficient devices requires high-quality thin films in order to ensure carrier mobility. With this purpose\, we developed processes for both ALD and MBE in order to optimise the deposition of Ga2O3 thin films. The research carried out in this work was strongly focused on the optimisation of the growth conditions\, in order to improve the films’ crystalline quality. \nFirst\, an ALD process using TEGa and O3 is designed\, yielding a growth rate of 0.42 ± 0.02 Å/cycle\, with an ALD window found between 250 and 400 °C. The growth of high-crystalline quality\, epitaxial (001) κ-Ga2O3 thin films on c-plane sapphire is then achieved for ultra-thin films (< 20 nm)\, and the epitaxial relationships between film and substrate are established as [001] κ-Ga2O3 || [0001] α-Al2O3\, [010] κ-Ga2O3 || [10-10] α-Al2O3 and [100] κ-Ga2O3 || [11-20] α-Al2O3. The growth mechanisms enabling the formation of the metastable κ-Ga2O3 phase are discussed. The effects of an increasing thickness on the crystalline structure of the films are then investigated by increasing the number of ALD cycles. Finally\, the Ga2O3 ALD layers are annealed and undergo phase transition to (-201) β-Ga2O3. \nIn the scope of assessing the feasibility of an AlN/Ga2O3 heterojunction\, we studied the MBE growth of AlN on Ga2O3. The nucleation of Al-polar AlN is optimised under N-rich conditions\, which result in high-quality layers with a sharp monoclinic-to-wurtzite transition. The epitaxial relationships are identified as [0001] AlN || ⟂ (-201) β-Ga2O3 and [2-1-10] AlN || [020] β-Ga2O3\, with an interface consisting of two monolayers of AlGaN. The challenging MBE growth of Ga2O3 is then investigated on AlN. The growth of single-phase (-201) β-Ga2O3 is achieved for temperatures above 630 °C\, and optimal structural properties are obtained for relatively low gallium fluxes. The epitaxial relationship identified as [020] β-Ga2O3 || <11-20> AlN\, with three rotational domains. As in the case of AlN on β-Ga2O3\, the interface is crystallographically sharp\, but it contains two AlGaN monolayers. \nThese results demonstrate the potential of ALD and MBE as growth techniques for future ultra-wide-bandgap power electronics\, and represent an important step towards the integration of Ga₂O₃ into advanced heterostructures. \n_ \nContact : deborah.verger@grenoble-inp.fr URL:https://sfp-alpes.fr/event/soutenance-de-these-de-andy-seguret/ LOCATION:Phelma\, Amphi M001\, 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:20260929T090000 DTEND;TZID=Europe/Paris:20260929T110000 DTSTAMP:20260918T125513Z CREATED:20260918T125513Z LAST-MODIFIED:20260918T125513Z UID:10000263-1790672400-1790679600@sfp-alpes.fr SUMMARY:Soutenance de Thèse par Nicholas GALLEGO-LACEY (CEA-Irig/Pheliqs) DESCRIPTION:Dynamique de spin singulet-triplet dans des boîtes quantiques à trous en germanium planaire\nRésumé : \nLes technologies quantiques connaissent un développement rapide\, largement porté par les perspectives offertes par l’informatique quantique. Contrairement aux ordinateurs classiques\, les ordinateurs quantiques exploitent des phénomènes quantiques tels que la superposition et l’intrication\, offrant potentiellement une augmentation considérable de la puissance de calcul. Cependant\, la conception de systèmes physiques capables de stocker et de manipuler l’information quantique de manière fiable demeure un défi majeur. Aujourd’hui\, plusieurs plateformes physiques sont étudiées pour l’informatique quantique\, notamment les circuits supraconducteurs\, les ions piégés\, les atomes neutres et les boîtes quantiques semiconductrices. Depuis la proposition des qubits de spin dans les semiconducteurs par Loss et DiVincenzo en 1998\, les boîtes quantiques se sont imposées comme une plateforme prometteuse pour l’étude et le contrôle des états quantiques. Plus récemment\, les spins de trous confinés dans des hétérostructures contraintes Ge/SiGe ont suscité un intérêt considérable en raison de leur fort couplage spin-orbite\, qui permet un contrôle rapide des qubits entièrement électrique\, ainsi que de leur compatibilité avec les technologies de fabrication des semiconducteurs existantes\, offrant ainsi des perspectives prometteuses pour leur montée en échelle. Cette thèse porte sur l’étude des systèmes à spin de trou réalisés dans des boîtes quantiques planaires Ge/SiGe et explore la nature des états quantiques pertinents pour les architectures de qubits de spin singulet–triplet et de type Loss–DiVincenzo. Dans ce but\, un procédé de nanofabrication a été développé afin de réaliser des dispositifs définis électrostatiquement fonctionnant dans le régime de quelques trous\, incluant des architectures à plusieurs boîtes quantiques intégrant des capteurs de charge. Les propriétés électroniques et de spin de ces dispositifs ont été caractérisées à l’aide de la réflectométrie radiofréquence par détection de charge. Les mesures obtenues mettent en évidence le lien étroit entre les procédés de fabrication et les performances des dispositifs\, soulignant l’importance de techniques de fabrication optimisées pour la réalisation de systèmes de boîtes quantiques de haute qualité. Un axe central de cette thèse a été l’étude de la relaxation des états quantiques pertinents pour la lecture des qubits de spin. À l’aide de mesures résolues en temps\, les dynamiques de relaxation et leur anisotropie ont été étudiées\, révélant une forte dépendance des temps de relaxation à l’orientation dans le plan du champ magnétique appliqué. Ces observations mettent en lumière le rôle essentiel du couplage spin-orbite et de l’anisotropie des facteurs g dans la détermination de la durée de vie des états quantiques. Les résultats apportent un éclairage direct sur les mécanismes de relaxation des spins de trous et montrent que la durée de vie des états de spin peut être modulée par l’orientation du champ magnétique\, avec des perspectives d’optimisation supplémentaires grâce à l’ingénierie du tenseur g. Enfin\, ces résultats suggèrent qu’une compréhension détaillée du tenseur g permet d’identifier les orientations optimales du champ magnétique maximisant la fidélité de lecture des qubits de spin et améliorant leurs performances globales​.​ \n_ \nATTENTION ! L’accès du site CEA nécessite une autorisation d’accès préalable. Merci de contacter à l’avance l’organisateur : Vivien Schmitt​ URL:https://sfp-alpes.fr/event/soutenance-de-these-par-nicholas-gallego-lacey-cea-irig-pheliqs/ LOCATION:CEA – Salle de Séminaire IRIG (1005 – 445)\, 17\, avenue des Martyrs\, Grenoble\, France CATEGORIES:Soutenance,Soutenance de Thèse ORGANIZER;CN="IRIG - CEA":MAILTO:irig.communication@cea.fr END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20260929T140000 DTEND;TZID=Europe/Paris:20260929T150000 DTSTAMP:20260910T152942Z CREATED:20260910T152942Z LAST-MODIFIED:20260910T152942Z UID:10000248-1790690400-1790694000@sfp-alpes.fr SUMMARY:Natali PLANK (School of Chemical and Physical Sciences and the MacDiarmid Institute for Advanced Materials and Nanotechnology\, Victoria University of Wellington\, New Zealand) DESCRIPTION:Nanowire and carbon nanotube device structures for Biosensors and Artificial Neural Networks\nRésumé : \nCarbon nanotube (CNT) networks offer a particularly attractive platform due to their simple fabrication\, tunable electronic properties\, and ability to be interrogated through multiple electrical contacts on a single chip [1]. Functionalised carbon nanotube and graphene field effect transistors (CNTFETs and GFETs) have been used as the active channel in biosensors\, with the future promise of lab-on-a-chip diagnostics strongly motivating the research [2]. The ability to effectively sense analytes depends on multiple factors\, the conductivity of the platform [3]\, the robustness of the functionalisation and the selectivity and function of the receptor [4]. \nCarbon nanotubes also offer an interesting base platform for neuromorphic computing via physical reservoirs. Physical reservoir computing exploits the intrinsic dynamics of complex materials to perform temporal information processing with low power consumption and minimal training requirements. Disordered networks of memristive nanowires have emerged as promising neuromorphic architectures\, as they can host large numbers of nonlinear junctions that collectively generate rich spatiotemporal dynamics [5-7]. \nHere I will present our recent work on the development of the CNTFET and GFET platforms with aptamers and insect odorant receptors and the different challenges and device constraints we have encountered. I will also present our work on the development of the CNT platform for physical reservoir computing applications. \n[1]      Topinka\, M. A\, et al. Nano Lett. 2009 9\, 1866–1871 \n[2]      T An et al\, Lab Chip\, 2010\,10\,2052-2056 \n[3]      M Thanihaichelvan M\, et al\, Biosensors and Bioelectronics\, 2019\, 130\, 408-413 \n[4]      Nguyen et al.\, Nanomaterials\, 2021 11 (9)\, 2280 \n[5]      Milano\, G\, et al. Nat. Mater. 2022\, 21 (2)\, 195–202. \n[6]      Kotooka\, T.\, et al. Thermally Stable Ag 2 Se Nanowire Network as an Effective In-Materio Physical Reservoir Computing Device. 2024\, 2400443\, 1–10. \n[7]      Zhu\, R.\, et al Online Dynamical Learning and Sequence Memory with Neuromorphic Nanowire Networks. Nat. Commun. 2023\, 14 (1)\, 6697. \n\nShort Bio/CV\nDr Natalie Plank is Deputy Director for Commercialisation and Industry Engagement and an Associate Professor in Physics in the School of Chemical and Physical Sciences at Victoria University of Wellington. Natalie completed a BSc (Hons) in Astrophysics at The University of Edinburgh before doing an MSc in Microelectronics. She then completed her PhD on the functionalisation of carbon nanotubes for molecular electronics with Rebecca Cheung also at The University of Edinburgh. \nNatalie’s research interests are in the area of nanomaterial device fabrication and the characterisation of novel materials. Her current work focuses on nanomaterial device platforms for sensing technology and artificial neural networks. She is interested in carbon nanotubes and ZnO nanowires for nanowire transistor applications and in particular the ability to functionalise the nanomaterial channels with specific biomarkers or memristive molecules. Natalie’s core interests are in low cost fabrication techniques which allow for high throughput of devices whilst maintaining the particular material properties of the unique nanowire system. \n_ \nContact : deborah.verger@grenoble-inp.fr URL:https://sfp-alpes.fr/event/natali-plank-school-of-chemical-and-physical-sciences-and-the-macdiarmid-institute-for-advanced-materials-and-nanotechnology-victoria-university-of-wellington-new-zealand/ 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:20260930T093000 DTEND;TZID=Europe/Paris:20260930T113000 DTSTAMP:20260911T092146Z CREATED:20260911T092146Z LAST-MODIFIED:20260911T092146Z UID:10000249-1790760600-1790767800@sfp-alpes.fr SUMMARY:Soutenance de Thèse par Liam JOHNSTON DESCRIPTION:Enabling and Modelling Alternative Precursors and Processes Using Spatial Atomic Layer Deposition (SALD)\nRésumé : \nAtomic layer deposition (ALD) and its spatial variant (SALD) allow for the conformal coating of any geometry with atomic-scale precision\, leading to applications in nanotechnology\, microelectronics\, and optoelectronics. These techniques commonly use pyrophoric compounds\, which react violently with air\, complexifying deposition and transport. However\, the intrinsically higher deposition rate in SALD could allow the study of precursors which are less dangerous\, more efficient\, and/or more eco-friendly without compromising productivity compared with an ALD process using a pyrophoric precursor. To this end\, Zn(DMP)2 8and Ga(DMP)Me2 are studied as non-pyrophoric precursors for the deposition of zinc and gallium-containing oxides\, while a general fundamental model is proposed for SALD and compared to numerical simulations. \n_ \nContact : deborah.verger@grenoble-inp.fr URL:https://sfp-alpes.fr/event/soutenance-de-these-par-liam-johnston/ LOCATION:Phelma – Room M255 (2nd floor)\, 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:20260930T140000 DTEND;TZID=Europe/Paris:20260930T160000 DTSTAMP:20260910T153213Z CREATED:20260903T151558Z LAST-MODIFIED:20260910T153213Z UID:10000236-1790776800-1790784000@sfp-alpes.fr SUMMARY:Soutenance de Thèse par Jamie SILK DESCRIPTION:Development and Optimization of a Sustainable Passive Atmospheric Water Harvesting Device\nRésumé : \nWater is essential for human life\, yet roughly two billion people worldwide still lack access to safely managed drinking water. With increasing pressure from rapid population growth and climate change\, there is a critical need for water generation technologies that are low-cost\, scalable\, and environmentally sustainable. Passive atmospheric water harvesting offers a promising solution by capturing moisture from the air without continuous energy input\, but current approaches are often limited by low efficiency or high cost. \nThis study aims to optimize a bioinspired mixed-wettability surface to enhance passive water collection by promoting both droplet nucleation and rapid transport of condensed water. The surface is fabricated using superhydrophobic zinc oxide nanowire (ZnO NW) arrays synthesized via a scalable sol-gel/chemical bath deposition method\, followed by functionalization with a non-fluorinated silane agent. Here\, we propose a novel “double-structured” ZnO NW array with hierarchical surface roughness. This novel morphology is assessed for its superhydrophobic property and benchmarked against other ZnO NW morphologies. Hydrophilic silica nanoparticles are then deposited on the superhydrophobic NW arrays to create the mixed wettability effect for water harvesting. Material performance is optimized by varying NW morphology\, surface wettability\, and nanoparticle concentration to maximize water collection rates and the stability of the material is tested over time to monitor for any degradation in performance. \nTo induce condensation without energy input\, this mixed-wettability surface is coupled with a passive daytime radiative cooling (PDRC) coating composed of bicontinuous interfacially jammed emulsion gels (bijels). Bijels are formed through the kinetic arrest of spinodal decomposition of two immiscible liquids by jamming nanoparticles at the liquid-liquid interface. These porous polymer films exhibit high solar reflectance and strong infrared emissivity which enables sub-ambient cooling by using cold outer space as a heat sink. The PDRC layer is optimized by adjusting the domain size and film thickness to achieve maximum cooling performance. In parallel\, a life cycle assessment (LCA) is conducted to evaluate the environmental impacts of material fabrication and identify key contributors to categories such as global warming potential\, water use\, and ozone depletion. This integrated approach informs design choices that minimize environmental burden. The results of this study show promise in developing a sustainable material with the ability to passively collect atmospheric water\, potentially aiding in providing clean water globally in the face of the climate crisis. \n_ \nContact : deborah.verger@grenoble-inp.fr URL:https://sfp-alpes.fr/event/soutenance-de-these-de-jamie-silk/ LOCATION:Phelma Minatec\, A102\, 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:20261002T110000 DTEND;TZID=Europe/Paris:20261002T120000 DTSTAMP:20260925T162127Z CREATED:20260925T162127Z LAST-MODIFIED:20260925T162127Z UID:10000278-1790938800-1790942400@sfp-alpes.fr SUMMARY:Joerg SCHMALIAN DESCRIPTION:Superconductivity in kagome metals due to soft loop-current fluctuations\nRésumé : \nWe demonstrate that soft fluctuations of translation symmetry-breaking loop currents provide a mechanism for unconventional superconductivity in kagome metals that naturally addresses the multiple superconducting phases observed under pressure. Focusing on the rich multi-orbital character of these systems\, we show that loop currents involving both vanadium and antimony orbitals generate low-energy collective modes that couple efficiently to electrons near the Fermi surface and mediate attractive interactions in two distinct unconventional pairing channels. While loop-current fluctuations confined to vanadium orbitals favor chiral d et id superconductivity\, which spontaneously breaks time-reversal symmetry\, the inclusion of antimony orbitals stabilizes an s± state that is robust against disorder. We argue that these two states are realized experimentally as pressure increases and the antimony-dominated Fermi surface sheet undergoes a Lifshitz transition. \n_ \nContact : julia.meyer@univ-grenoble-alpes.fr \nLe séminaire théorie est financé par la fédération de recherche Quantalps. URL:https://sfp-alpes.fr/event/joerg-schmalian/ LOCATION:CEA\, Salle de Conférence à l’Entrée Principale\, 17\, avenue des Martyrs\, Grenoble\, 38000\, France CATEGORIES:Séminaire END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20261002T140000 DTEND;TZID=Europe/Paris:20261002T160000 DTSTAMP:20260924T081457Z CREATED:20260918T130058Z LAST-MODIFIED:20260924T081457Z UID:10000264-1790949600-1790956800@sfp-alpes.fr SUMMARY:Soutenance de thèse par Romy MORIN (CEA-Irig/Pheliqs) DESCRIPTION:Dynamique des quasiparticules dans les supraconducteurs désordonnés avec couplage spin-orbite\nRésumé : \nLa supraconductivité est un état de la matière dans lequel les électrons forment un condensat de paires de Cooper de spins opposés. Par excitation d’énergie supérieure à deux fois le gap supraconducteur\, ces paires peuvent être brisées en deux quasiparticules indépendantes. À l’équilibre thermique\, la théorie BCS prédit une concentration de quasiparticules exponentiellement faible\, quasiment nulle à l’échelle du millikelvin. De nombreuses expériences ont cependant mis en évidence un excès significatif de quasiparticules\, dégradant les dispositifs supraconducteurs en réduisant les temps de cohérence des qubits et les facteurs de qualité des résonateurs. Cet excès\, provenant de multiples sources environnementales (photons IR\, phonons\, muons…)\, est difficile à éliminer. Comprendre la dynamique des quasiparticules devient essentiel pour prévenir leur « empoisonnement » des dispositifs quantiques. Dans les supraconducteurs désordonnés\, les fluctuations spatiales du gap peuvent piéger les quasiparticules\, modifiant ainsi leur spectre et entravant leur recombinaison en paires de Cooper. Cette thèse vise à mieux comprendre la recombinaison des quasiparticules dans les supraconducteurs désordonnés\, en étudiant (i) le spectre des états liés d’une déplétion locale du gap\, et (ii) les taux de relaxation de spin inélastiques\, nécessaires à la recombinaison. Dans un premier projet\, nous présentons un modèle minimal d’une déplétion locale du gap dans un supraconducteur propre. Une approche semiclassique révèle l’existence de multiples états liés dont le nombre dépend de la taille et de la profondeur de la variation du gap. En dimensions supérieures à un\, ce nombre devient très élevé pour un piège de taille typique de l’ordre de la longueur de cohérence. Une description complète via les équations de Bogoliubov-de Gennes montre qu’en dimension deux et trois\, un nombre infini d’états liés supplémentaires s’accumule près du bord du gap\, même pour des pièges arbitrairement petits. Les fonctions d’onde associées sont maximales à l’extérieur du piège et décroissent exponentiellement sur des longueurs caractéristiques très grandes. Ce modèle offre un cadre unifié décrivant les états liés sur toute une gamme de taille de pièges\, avec des implications directes pour les processus de recombinaison. Dans un second projet\, nous investiguons la recombinaison des quasiparticules en paires de Cooper singulet. Un unique piège abrite un grand nombre d’états liés\, de fait\, les quasiparticules piégées de spin opposé sont amenées à se recombiner rapidement. Progressivement le système est conduit vers une configuration où il ne reste que des quasiparticules de même spin. Le spin-flip devient alors un canal de recombinaison indispensable à étudier. Une analyse complète nécessite de combiner trois mécanismes: (i) l’interaction électron-phonon (relaxation d’énergie)\, (ii) le couplage spin-orbite faible (relaxation de spin)\, et (iii) le désordre inhérent aux matériaux réels. Une telle combinaison n’ayant jamais été pleinement établie\, même dans l’état métallique\, nous étudions la relaxation inélastique de spin via la règle d’or de Fermi comme première étape vers la recombinaison dans les supraconducteurs. Premièrement\, nous retrouvons le taux de relaxation inélastique en régime diffusif\, variant quartiquement en énergie car supprimé par le désordre\, comme prédit par Schmid. Puis\, nous calculons le taux de spin-flip élastique dans un métal désordonné\, proportionnel au taux de relaxation sans spin-flip. Enfin\, nous dérivons le taux de spin-flip inélastique dans un métal propre\, présentant une dépendance en puissance cinq de l’énergie. Ces deux taux présentent un préfacteur quartique en couplage spin-orbite\, suggérant que la relaxation de spin constituerait le facteur limitant de la recombinaison. L’extension au cas inélastique désordonné ainsi que la généralisation au cas supraconducteur sont esquissées\, ouvrant la voie à un calcul complet du taux de recombinaison.​ \n_ \nATTENTION ! L’accès du site CEA nécessite une autorisation d’accès préalable. Merci de contacter à l’avance l’organisateur : Julia Meyer \n  URL:https://sfp-alpes.fr/event/soutenance-de-these-par-romy-morin-cea-irig-pheliqs/ LOCATION:CEA – Salle de Séminaire IRIG (1005 – 445)\, 17\, avenue des Martyrs\, Grenoble\, France CATEGORIES:Soutenance,Soutenance de Thèse ORGANIZER;CN="IRIG - CEA":MAILTO:irig.communication@cea.fr END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20261006T140000 DTEND;TZID=Europe/Paris:20261006T150000 DTSTAMP:20260928T082945Z CREATED:20260925T151755Z LAST-MODIFIED:20260928T082945Z UID:10000268-1791295200-1791298800@sfp-alpes.fr SUMMARY:Chika OTANI (Tokyo University\, Japan​) DESCRIPTION:Exploring Quantum Spintronics -Research and Internship Opportunities in Japan\nRésumé : \n\n\nWould you like to experience research in Japan and become part of an international collaboration in spintronics? \nIn this seminar\, I will introduce the Japan–France ASPIRE Q-Spintronics Project\, an international program that brings together researchers and students from leading laboratories in Japan and France. Our goal is not only to explore new frontiers of spintronics\, but also to create opportunities for young researchers to cross borders\, learn new experimental techniques\, and develop their own international research networks. \nI will first give an accessible introduction to some of the science we are exploring—from spin and orbital angular momentum transport to interactions between magnons and phonons. These rapidly developing areas raise fundamental questions about how angular momentum and information can be generated\, transported\, and controlled in nanoscale materials and devices.\n\nI will then introduce the participating Japanese laboratories at Tohoku University\, the University of Tokyo\, Osaka University\, and JAEA\, highlighting the different research environments and experimental techniques available at each location. Students may have opportunities to participate in nanofabrication\, electrical transport\, magneto-optical measurements\, synchrotron experiments\, high-frequency measurements\, and studies of magnetization dynamics. \n\nFinally\, I will explain how Master’s and PhD students\, as well as young researchers\, can visit Japan for internships or research stays through the ASPIRE collaboration\, including possible research topics and financial support. Whether you already work in spintronics or are simply curious about doing research in Japan\, this seminar will provide an introduction to the scientific and international opportunities offered by Q-Spintronics.​\n​\n_\n\n\n\n\n\nATTENTION ! L’accès au CEA est réservé aux porteurs de laissez-passerP​resential access to the conference room at CEA in Grenoble requires an entry authorization.\nPlease\, request it before September 28th at admin.spintec@cea.fr\n\n\n\n\n​​Video conference : link URL:https://sfp-alpes.fr/event/chika-otani-tokyo-university-japan/ LOCATION:CEA – Salle de Séminaire IRIG (1005 – 445)\, 17\, avenue des Martyrs\, Grenoble\, France CATEGORIES:Séminaire ORGANIZER;CN="IRIG - CEA":MAILTO:irig.communication@cea.fr END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20261008T160000 DTEND;TZID=Europe/Paris:20261008T170000 DTSTAMP:20260409T110853Z CREATED:20260409T110848Z LAST-MODIFIED:20260409T110853Z UID:10000124-1791475200-1791478800@sfp-alpes.fr SUMMARY:Cecile ENGRAND DESCRIPTION:Les micrométéorites : les messagères de notre origine\n_ \nToutes les informations sont disponibles sur : https://indico.ijclab.in2p3.fr/event/13491/ \nContact : louis.fayard@IJCLAB.INP3.FR \n  \n  URL:https://sfp-alpes.fr/event/cecile-engrand/ LOCATION:Laboratoire IJCLab – Auditorium Pierre Lehmann\, Rue Ampère\, Orsay cedex\, 91898\, France CATEGORIES:Séminaire END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20261009T100000 DTEND;TZID=Europe/Paris:20261009T120000 DTSTAMP:20260917T145411Z CREATED:20260917T145411Z LAST-MODIFIED:20260917T145411Z UID:10000257-1791540000-1791547200@sfp-alpes.fr SUMMARY:Soutenance de Thèse par Corentin GUERIN (CEA-Irig/Pheliqs) DESCRIPTION:Réalisation d’hétérostructures III-Nitrures pour l’émission UV profond : du matériau au dispositif\nRésumé : \nNous explorons ici plusieurs sujets connexes autour de l’émission dans la gamme UV-C pour des applications dans le domaine de la désinfection. Dans un premier temps\, nous étudions la croissance de l’AlN en structure nanofil par reprise d’épitaxie réalisée par une technique d’épitaxie par jets moléculaires (EJM) sur des nano-piliers de GaN. Nous étudions les conditions optimales de croissance EJM puis établissons un mode de croissance optimisé pour nos nanofils d’AlN utilisant une méthode de croissance alternée (Migration Enhanced Epitaxy). Suite à l’observation de défauts d’empilements étendus dans le plan basal des sections d’AlN\, assimilables à des inclusions cubiques le long de la matrice wurtzite\, nous identifions le caractère luminescent de ces défauts à basse température et établissons un modèle prédictif liant le nombre de plans de la faute d’empilement à son énergie d’émission. Dans un troisième temps\, nous étudions les propriétés de luminescence en température et résolues en temps d’un puits quantique GaN/AlN ultra-fin\, d’épaisseur graduée inférieure à une monocouche\, qui émet dans l’UV-C profond entre 240 nm et 220 nm. Etablissant les propriétés de la structure en luminescence résolue en temps\, nous établissons un modèle basé sur la fuite thermoionique de l’électron dans la barrière AlN\, permettant d’expliquer la chute de rendement quantique externe observée dans les émetteurs UV-C profonds. En outre\, nous détaillons la réalisation d’une Diode Électroluminescente réalisée par EJM et la réalisation du contact p. Nous démontrons une émission à 260 nm en électroluminescence\, pour un très faible EQE de 5.10−3%. Enfin\, nous proposons une méthode de mesure du rendement radiatif par excitation électronique\, basée sur l’utilisation d’une sphère intégrante à l’intérieur d’un microscope électronique.​ \n  URL:https://sfp-alpes.fr/event/soutenance-de-these-par-corentin-guerin-cea-irig-pheliqs/ LOCATION:CNRS – Salle Nevill Mott (D420)\, CNRS - Institut Néel 25 avenue des Martyrs\, Grenoble\, 38042\, France CATEGORIES:Soutenance,Soutenance de Thèse ORGANIZER;CN="IRIG - CEA":MAILTO:irig.communication@cea.fr END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20261012T100000 DTEND;TZID=Europe/Paris:20261015T130000 DTSTAMP:20260626T084843Z CREATED:20260625T151925Z LAST-MODIFIED:20260626T084843Z UID:10000209-1791799200-1792069200@sfp-alpes.fr SUMMARY:OLIMPICS 2026 : Physics and living systems DESCRIPTION:We are pleased to announce the 2026 conference « Physics and living systems » of the OLIMPICS federation (CNRS\, UGA\, G-INP\, CEA). It will take place in the Bauges Massif (Lescheraines)\, from Monday\, October 12 at 10:00 am to Thursday\, October 15 at 1:00 pm. \nRegistrations and abstract submissions will be open from now until July 31th. \nThis event is intended to give early-career scientists the opportunity to present their work and build their network. Therefore\, we strongly encourage the participation of PhD students and PostDocs. Scientific talks will be complemented by off-topic talks\, free time for discussions and poster sessions. \nA shuttle service will be operated from Grenoble and Chambéry train stations to/from the conference venue at the beginning and end of the conference. \n  \nWe will have the pleasure of welcoming four guest speakers on each of the four major themes that make up our community : \n– Stéphanie Descroix (DR CNRS\, Institut Curie\, Paris) – Theme : Investigating the living world \n– Yanxia Hou-Broutin (DR CNRS\, SyMMES\, Grenoble) – Theme : Bio-inspired physics and engineering \n– Guillaume Salbreux (Prof. Université de Genève\, Department of Genetics and Evolution) Theme : Dynamics of living systems \n– Julien Gautrot (Prof. Univ. London\, Centre for Molecular Biochemical Engineering) Theme: Physical interactions \n  \nMore information on the conference venue\, registration\, access map\, registration fees\, and other practical information is available on our website : https://olimpics2026.sciencesconf.org \n_ \nContact : olimpics2026@sciencesconf.org URL:https://sfp-alpes.fr/event/olimpics-2026-physics-and-living-systems/ LOCATION:L’Eau Vive – Géopark des Bauges\, Base de Loisirs de Lescheraines\, Lescheraines\, 73340\, France CATEGORIES:Conférence,Evènements END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20261013T140000 DTEND;TZID=Europe/Paris:20261013T150000 DTSTAMP:20260918T144108Z CREATED:20260918T143923Z LAST-MODIFIED:20260918T144108Z UID:10000265-1791900000-1791903600@sfp-alpes.fr SUMMARY:Chung-Hou CHUNG (1 Department of Electrophysics\, National Yang Ming Chiao Tung University\, Hsinchu\, Taiwan - 2 Physics Division\, National center for Theoretical Sciences\, Taipei\,Taiwan) DESCRIPTION:A theory for quantum-critical Planckian strange metal phase in high-Tc cuprate superconductors\nRésumé : \nThe strange metallic state showing incoherent charge transport with universal linear-in-temperature scattering rate: 1/τ = αP kB T / ħ with αP ~ 1 and logarithmic-in-temperature singular specific heat coefficient\, so-called “Planckian metal”\, has been observed in various high-Tc cuprate superconductors over a finite range in doping near optimal doping [1]. Understanding this state is believed to be the key to revealing the mechanism for high-Tc superconductivity. Here\, we propose a generic microscopic mechanism for this state based on quantum-critical local bosonic charge Kondo fluctuations coupled to both spinon and a heavy conduction-electron Fermi surfaces within the heavy-fermion formulated slave-boson t-J model [2]. Our theory is motivated by the striking similarity in strange metal phenomenology between cuprates and heavy-fermion Kondo lattice systems [3]. By a controlled perturbative renormalization group analysis of our effective heavy-fermion model\, we examine the competition between the pseudogap phase\, characterized by Anderson’s Resonating-Valence-Bond spin-liquid made of fermionic spin-singlet spinons\, and the Fermi-liquid state modeled by coherent electron hopping (charge Kondo hybridization). We find an extended quantum-critical metallic phase with a universal Planckian ħω/kBT scaling in scattering rate near a localized-delocalized (pseudogap-to-Fermi liquid) charge-Kondo breakdown transition of the model. The d-wave superconducting ground state emerges near the transition. Unprecedented qualitative and quantitative agreements are reached between our theoretical predictions and various experiments\, including ħω/kBT scaling in optical conductivity [4]\, universal doping-insensitive field-to-temperature (B/T-) scaling in magnetoresistance [5]\, singular specific heat coefficient [6]\, marginal Fermi-liquid spectral function observed in ARPES [7]\, and Fermi surface reconstruction observed in Hall coefficients in various overdoped cuprates [5\,8]. We further applied this framework to obtain a universal quantum-critical B/T-scaling in magneto-transport and unify the B-linear and T-linear Planckian scattering rate observed in LSCO over an extended doping range\, pointing toward a unified quantum–critical origin of Planckian transport in cuprates [9]. This universal Planckian metal phase can be realized within a solvable large-N multi-channel Kondo lattice model generalized from this heavy-fermion formulated tJ model [10]. Our mechanism offers a microscopic understanding of the quantum-critical Planckian metal phase observed in cuprates and its link to the pseudogap\, d-wave superconducting\, and Fermi liquid phases. It offers a promising route for understanding how d-wave superconductivity emerges from such a strange metal phase in cuprates–one of the long-standing open problems in condensed matter physics since 1990s. \nReferences \n\nLegros et al.\, Nat. Phys. 15\, 142 (2019).\nA mechanism for quantum-critical Planckian metal phase in high-temperature cuprate superconductors\, YY Chang\, K Van Nguyen\, K Remund\, C.H. Chung*\, Reports on Progress in Physics\, 88\, 048001 (2025).\nThe scaled-invariant Planckian metal and quantum criticality in Ce1-xNdxCoIn5\, Yung-Yeh Chang\, Hechang Lei\, Cedomir Petrovic*\, Chung-Hou Chung*\, Nature Communications 14 (581) (2023); A mechanism for the strange metal phase in rare-earth intermetallic compounds”\, Jiangfan Wang\, Yung-Yeh Chang and Chung-Hou Chung*\, Proceedings of the National Academy of Sciences (PNAS)\, Volume 119(10) e2116980119 March 1\, 2022; Strange superconductivity near an antiferromagnetic heavy fermion quantum critical point\, Y. Y. Chang\, F. Hsu\, S. Kirchner\, C. Y. Mou\, T. K. Lee\, C. H. Chung*\, Phys. Rev. B 99\, 094513 (2019); Mechanism of a strange metal state near a heavy-fermion quantum critical point\, Yung-Yeh Chang\, Silke Paschen\, Chung-Hou Chung*\, Phys. Rev. B 97\, 035156 (2018).\nB. Michon et al.\, Nature Communications 14\, 3033 (2023).\nJ. Ayres et al.\, Nature 595\, 661 (2021).\nB. Michon et al.\, Nature 567\, 218 (2019).\nS.D. Chen et al.\, Science\, 366\, 1099 (2019).\nC. Proust et al.\, Annual Review of Condensed Matter Physics 10\, 409 (2019).\nUniversality of T –linear and B–linear Planckian scattering rate in high–Tc cuprate superconductors\, K. Remund\, K. V. Nguyen\, P.-H. Chou\, P. Giraldo-Gallo\, J. A. Galvis\, G. S. Boebinger\, and C.-H. Chung*\, arXiv:2602.10627.\nTheory of universal Planckian metal phase in t-J model: application for high-temperature cuprate superconductors\, YY Chang\, K Van Nguyen\, K Remund\, CH Chung*\, arXiv:2506.15552\n\n_ \nContact : david.leboeuf@lncmi.cnrs.fr URL:https://sfp-alpes.fr/event/chung-hou-chung-1-department-of-electrophysics-national-yang-ming-chiao-tung-university-hsinchu-taiwan-2-physics-division-national-center-for-theoretical-sciences-taipeitaiwan/ 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:20261013T140000 DTEND;TZID=Europe/Paris:20261013T150000 DTSTAMP:20261002T092401Z CREATED:20261002T092401Z LAST-MODIFIED:20261002T092401Z UID:10000284-1791900000-1791903600@sfp-alpes.fr SUMMARY:Maria del Mar RODRIGUEZ ROBLES DESCRIPTION:Transparent electrodes based on silver nanowire networks protected by nitrides\nRésumé : \nSilver nanowire (AgNW) networks are promising alternatives to indium tin oxide (ITO) for transparent electrodes\, combining excellent optoelectronic performance\, mechanical flexibility\, and compatibility with scalable fabrication processes1. However\, their practical implementation is hindered by poor adhesion to substrates and degradation under thermal\, electrical\, mechanical\, and environmental stresses. These limitations are related to the high surface-to-volume ratio of AgNWs\, which promotes chemical reactivity\, surface diffusion\, and morphological instability2. \nThis thesis explores transition metal nitrides as protective coatings for AgNW networks3\, with the aim of improving their adhesion and long-term stability while preserving their optical and electrical performance. Nitrides such as TiN and AlN are particularly attractive because of their high hardness\, chemical inertness\, and thermal and mechanical stability. Despite these properties\, their use for protecting metallic nanowire networks remains largely unexplored. \nDifferent deposition strategies\, including Physical Vapor Deposition (PVD)\, Plasma-Enhanced Atomic Layer Deposition (PE-ALD)\, and Area-Selective Deposition using PE-ALD (ASD-PEALD)\, are investigated to develop controlled nitride coatings on AgNW networks. The thesis examines how the coating characteristics influence the structural\, optical\, and electrical properties of the electrodes\, as well as their stability under electrical\, thermal\, mechanical\, and environmental stresses. \nOverall\, this work aims to establish the potential of nitride-based protective strategies for overcoming the stability and adhesion limitations of AgNW transparent electrodes. The results provide new insights into the relationship between protective coating design\, nanowire stability\, and electrode performance\, contributing to the development of more durable and reliable transparent electrodes. \n1          S. Maurya\, L. Labeyrie\, K. Zimny\, M. D. M. Rodriguez-Robles\, B. Zheng\, S. Schumacher\, D. Muñoz-Rojas\, D. Bellet and M. Tréguer-Delapierre\, Advances in Physics: X\, 2025\, 10\, 2573818. \n2          L. Bardet\, D. T. Papanastasiou\, C. Crivello\, M. Akbari\, J. Resende\, A. Sekkat\, C. Sanchez-Velasquez\, L. Rapenne\, C. Jiménez\, D. Muñoz-Rojas\, A. Denneulin and D. Bellet\, Nanomaterials\, 2021\, 11\, 2785. \n3          D. T. Papanastasiou\, A. Mantoux\, A. Crisci\, H. Ribeiro\, A. Sekkat\, H. Roussel\, M. Weber\, L. Rapenne\, C. Jiménez\, M. Fivel\, D. Bellet\, E. Blanquet and D. Muñoz-Rojas\, ACS Appl. Nano Mater.\, 2024\, 7\, 12312–12322. \nShort Bio/CV \nI am a third-year PhD student at the LMGP and SIMaP labs with a background in nanoscience. As part of the ANR LES MENINES project\, my research focuses on the development of protective coatings for metallic nanowires for transparent electrodes applications via physical vapor and atomic layer deposition techniques\, with a special interest in nitrides and oxide coatings. \n_ \nContact : deborah.verger@grenoble-inp.fr URL:https://sfp-alpes.fr/event/maria-del-mar-rodriguez-robles/ 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:20261013T140000 DTEND;TZID=Europe/Paris:20261013T150000 DTSTAMP:20261009T091812Z CREATED:20261009T091812Z LAST-MODIFIED:20261009T091812Z UID:10000297-1791900000-1791903600@sfp-alpes.fr SUMMARY:Landry BRETHEAU (PMC\, Ecole Polytechnique\, CNRS\, IPP\, Palaiseau\, France) DESCRIPTION:Nonlocal Josephson effect in an Andreev molecule\nRésumé : \nHybrid Josephson junctions – in which quantum conductors are used as weak links – offer a rich playground for novel quantum phenomena. They host localized fermionic states knowns as the Andreev bound states (ABS)\, which mediate the Josephson effect and carry the resulting supercurrent. When two such junctions are placed in close vicinity\, the ABS wavefunctions hybridize\, forming an Andreev molecule. In this regime\, the Josephson effect becomes nonlocal: the supercurrent flowing through one junction depends directly on the superconducting phase applied across the other. In this seminar\, I will present our recent experimental realization 1 of an Andreev molecule built on ultraclean carbon nanotubes\, which constitute elementary one-dimensional weak links. Using this platform\, we observed a pronounced nonlocal Josephson response and demonstrated that it stems from the formation of delocalized Andreev molecular states extending across both junctions. Furthermore\, we show that ground-state parity transitions induce characteristic π-phase shifts in the nonlocal response. Our findings demonstrate that the nonlocal Josephson effect offers a direct access into both the spatial structure and the global fermion parity of delocalized superconducting states. \n_ \nContact : equipe-seminaires-nano@listes.grenoble.cnrs.fr URL:https://sfp-alpes.fr/event/landry-bretheau-pmc-ecole-polytechnique-cnrs-ipp-palaiseau-france/ 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:20261013T140000 DTEND;TZID=Europe/Paris:20261013T160000 DTSTAMP:20260925T153332Z CREATED:20260925T153332Z LAST-MODIFIED:20260925T153332Z UID:10000270-1791900000-1791907200@sfp-alpes.fr SUMMARY:Soutenance de Thèse par Maria VAL PEVIDA (CEA-Irig/IBS) DESCRIPTION:Structural study of NADPH oxidase complex NOX1 by cryo-electron microscopy\nRésumé : \nMembrane proteins (MPs) constitute a major class of pharmaceutical targets due to their central roles in essential physiological processes. Among them\, NADPH oxidases (NOX) comprise a family of transmembrane enzymes involved in numerous crucial cellular functions — including host defence\, hormone synthesis\, vascular tone regulation\, and equilibrium — through the regulated production of reactive oxygen species (ROS). NOX1\, one of the human NOX isoforms\, is predominantly expressed in the intestinal epithelium\, where it forms a heterodimeric complex with p22phox in the membrane. Dysregulation of NOX1 activity\, often arising from genetic mutations\, has been associated with early-onset colorectal cancer and inflammatory bowel disease (IBD). Elucidating the three-dimensional structures of MPs and their mechanistic properties is essential to accelerate structure-based drug design strategies. Cryo-electron microscopy (cryo-EM) has become a powerful technique for resolving MPs structures at atomic resolutions. However\, structural determination of small MPs (<100 kDa) remains challenging due to their low expression levels\, low signal-to-noise ratios\, dependence on detergent solubilisation\, and intrinsic conformational flexibility\, all which complicating particle alignment and high-resolution structure reconstruction. To overcome these limitations\, antigen-binding fragments (Fabs) are frequently employed as fiducials to increase particle size and stabilise specific conformations by binding to defined epitopes. \nIn this thesis\, a lentiviral-based expression system was developed for the overexpression of the NOX1/p22phox complex in HEK293 T-Rex cells. Initial attempts to determine the structure of wild-type NOX1 were unsuccessful due to low production yield and the small size of the complex\, compounded by the lack of a commercially available monoclonal antibody targeting NOX1. To overcome these limitations\, co-expression with the EROS chaperone\, combined with the engineering of a NOX1 mutant\, named NOX12\, enabled improved production. This mutant incorporates modifications in extracellular loops to allow specific recognition by the anti-NOX2 Fab7D5. This strategy increased particle size\, allowing particle alignment and facilitating structural determination of the complex by cryo-EM. High-resolution structure of the core of NOX12 in complex with p22phox and Fab7D5 was determined at an overall resolution of 2.8 Å. In addition\, the structure of the NOX12/p22phox in complex with EROS and Fab7D5 was resolved at an overall resolution of 3.2 Å. This structure revealed a previously uncharacterised interaction mode between EROS and the catalytic subunit. Furthermore\, the structural framework enabled analysis of disease-associated mutations in NOX1 and provided insights into oxygen access pathways. \nThis work provides the first structural insights into NOX1 isoform in complex with its partner p22phox and together with the EROS chaperone\, establishing a framework for understanding its stabilisation and maturation. In addition\, the successful implementation of protein epitope engineering highlights a broadly applicable strategy for studying other NOX isoforms that lack specific antibodies\, in both resting and activated states\, thereby enabling cryo-EM characterisation across this family of MPs. Further studies will be required to elucidate the detailed molecular mechanisms underlying NOX1 activation. ​​​​ \n_ \n\n\nLes séminaires et soutenances sont ouverts à tous\, notez toutefois que l’accès au campus EPN nécessite un avis de rendez-vous. Merci de remplir ce formulaire et de l’adresser\, plus de 48h à l’avance\, à ce contact.\nPensez à vous munir d’une pièce d’identité le jour de votre visite. URL:https://sfp-alpes.fr/event/soutenance-de-these-par-maria-val-pevida-cea-irig-ibs/ LOCATION:IBS – Salle des séminaires\, IBS 71 avenue des Martyrs\, Grenoble\, 38042\, France CATEGORIES:Soutenance,Soutenance de Thèse ORGANIZER;CN="IRIG - CEA":MAILTO:irig.communication@cea.fr END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20261013T140000 DTEND;TZID=Europe/Paris:20261013T160000 DTSTAMP:20261008T150927Z CREATED:20261008T150927Z LAST-MODIFIED:20261008T150927Z UID:10000294-1791900000-1791907200@sfp-alpes.fr SUMMARY:Soutenance de Thèse par Thomas VASSELON DESCRIPTION:Dynamics of ultrashort plasmonic excitations in nanoelectronic quantum circuits\nLa soutenance  se déroulera en anglais. \nRésumé : \nLes technologies quantiques nécessitent des plateformes physiques capables de transporter et de manipuler l’information quantique tout en préservant sa cohérence. Une alternative aux plateformes photoniques consiste à utiliser des électrons se propageant dans des nanostructures semi-conductrices\, donnant naissance au domaine de l’optique quantique électronique. Une manière de générer des excitations électroniques individuelles consiste à appliquer des impulsions de tension ultracourtes à une mer de Fermi\, générant des paquets d’ondes électroniques ou des excitations plasmoniques. Des travaux récents ont démontré des phénomènes d’interférence avec des paquets d’ondes électroniques individuels de 27 ps dans un interféromètre électronique de Mach–Zehnder. Cependant\, l’étendue spatiale de l’excitation restait comparable à la taille du dispositif. \nL’objectif de cette thèse est de générer des paquets d’ondes électroniques plus courts que la longueur caractéristique des circuits nanoélectroniques\, afin d’atteindre un régime dans lequel de nouveaux phénomènes d’interférence quantique induits par la charge sont attendus. Ces phénomènes hors équilibre\, connus sous le nom d’oscillations de charge dynamiques\, résultent d’une phase imprimée sur la mer de Fermi par les paquets d’ondes électroniques. Cette phase peut être sondée au moyen d’interféromètres électroniques en mesurant le courant en fonction de la charge injectée. \nDeux approches complémentaires sont étudiées pour accéder à ce régime. La première repose sur un interféromètre à base de boîte quantique fonctionnant avec une électronique conventionnelle dans le domaine des GHz\, où les premières signatures des oscillations de charge dynamiques sont observées. La seconde consiste à développer une nanoélectronique THz permettant de générer des impulsions de tension aussi courtes que 1 ps. Nous démontrons le contrôle actif de plasmons THz dans un guide d’onde électronique unidimensionnel. Ces travaux ouvrent la voie à l’observation des oscillations de charge dynamiques dans des dispositifs plus génériques\, tels que des interféromètres de Fabry–Pérot ou de Mach–Zehnder. \nCette thèse démontre une dynamique ultrarapide dans des circuits nanoélectroniques\, permettant d’atteindre de nouvelles frontières pour les circuits quantiques fonctionnant à des vitesses sans précédent. \n__________________________________________________________________________________________________________________________________ \nAbstract : \nQuantum technologies require physical platforms capable of transporting and manipulating quantum information while preserving coherence. An alternative to photonic platforms is to use electrons propagating through semiconductor nanostructures\, giving rise to the field of electron quantum optics. One way to generate single-electron excitations is to apply ultrashort voltage pulses to a Fermi sea\, generating electronic wavepackets or plasmonic excitations. Recent results demonstrated interferometry with 27-ps-long single-electron wavepackets in an electronic Mach-Zehnder. However\, the spatial extent of the excitation was comparable to the size of the device. \nThe aim of this thesis is to generate electronic wavepackets shorter than the characteristic length of nanoelectronic circuits\, reaching a regime where new charge-induced quantum interference is expected to arise. These out-of-equilibrium phenomena\, known as dynamical charge oscillations\, emerge from a phase imprinted onto the Fermi sea by the electronic wavepackets. This phase can be probed through electronic interferometers by measuring the current as a function of the injected charge. \nTwo complementary approaches are investigated to access this regime. The first relies on a quantum-dot-based interferometer operating with conventional GHz electronics\, where first signatures of dynamical charge oscillations are observed. The second consists of developing THz nanoelectronics to generate voltage pulses as short as 1 ps. We demonstrate active control of THz plasmons in a one-dimensional electronic waveguide. This opens a route towards observing dynamical charge oscillations in more generic devices\, such as Fabry–Pérot or Mach–Zehnder interferometers. \nThis thesis demonstrates ultrafast dynamics in nanoelectronic circuits\, reaching new frontiers for quantum circuits operating at unprecedented speeds. \n_ \nContact : christopher.bauerle@neel.cnrs.fr URL:https://sfp-alpes.fr/event/soutenance-de-these-par-thomas-vasselon/ LOCATION:CNRS – Bâtiment A\, CNRS - Institut Néel 25 avenue des Martyrs\, Grenoble\, 38054\, France CATEGORIES:Soutenance,Soutenance de Thèse END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20261014T140000 DTEND;TZID=Europe/Paris:20261014T150000 DTSTAMP:20261009T130453Z CREATED:20261009T130453Z LAST-MODIFIED:20261009T130453Z UID:10000301-1791986400-1791990000@sfp-alpes.fr SUMMARY:Liuba GOSTEVA (LPMMC) DESCRIPTION:Scaling regimes of the 1D Kuramoto-Sivashinsky equation\nRésumé : \nThe Kuramoto-Sivashinsky (KS) equation describes various phenomena exhibiting chaos and instabilities\, including flames\, reaction-diffusion processes\, and thin liquid film flows. It resembles the Kardar-Parisi-Zhang (KPZ) equation\, with the key difference being the negative « viscosity » in the KS equation. The KS equation is known to belong to the KPZ universality class: at large scales\, its statistical properties are governed by the KPZ fixed point\, characterized by the dynamical exponent $z=3/2$ and a known PDF of fluctuations. In this talk\, I will analyze the stochastic KS equation using the functional renormalization group (FRG). In this framework\, attractive fixed points of the FRG equation determine large-scale universal behavior\, while unstable fixed points govern small-scale universal behavior. I will show that the two-point correlation function exhibits\, besides the KPZ scaling at large scale\, another universal scaling regime at small scale\, with $z=1$. This scaling is very robust as it is intrinsic to the KS dynamics. It arises from the vanishing of the effective viscosity when evolving from its microscopic negative KS value\, to its macroscopic effective positive KPZ value. I will also present results from direct numerical simulations\, which confirm these findings. The talk is based on the following articles: 1 L. Gosteva\, D. Roy\, N. Wschebor\, and L. Canet\, arXiv:2605.23364 (2026). 2 L. Gosteva\, N. Wschebor\, and L. Canet\, arXiv:2607.15784 (2026). \n_ \nContact : pierre.nataf@lpmmc.cnrs.fr URL:https://sfp-alpes.fr/event/liuba-gosteva-lpmmc/ 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:20261015T130000 DTEND;TZID=Europe/Paris:20261015T150000 DTSTAMP:20261011T173818Z CREATED:20260925T154138Z LAST-MODIFIED:20261011T173818Z UID:10000272-1792069200-1792076400@sfp-alpes.fr SUMMARY:ATTENTION !!! Changement de lieu !!! Soutenance de Thèse par Mohamad WAHIDI (CEA-Irig/LPCV) DESCRIPTION:Mécanismes régulateurs à l’échelle du génome impliqués dans l’intégration des signaux lumineux et du CO₂ chez Chlamydomonas reinhardtii\nRésumé : \nLes microalgues sont des algues unicellulaires microscopiques que l’on trouve généralement dans les systèmes d’eau douce et marins et qui peuvent vivre à la fois dans les colonnes d’eau et sur le sol. Ces organismes ont développé la capacité de répondre à des stimuli externes potentiellement mortels\, tels qu’une faible disponibilité environnementale de CO2\, au cours desquels ils activent un mécanisme appelé mécanisme de concentration de CO2 (CCM)\, pour augmenter les niveaux de fixation interne du CO2 dans le pyrénoïde de leurs chloroplastes. Ils ont également développé des propriétés photoprotectrices pour pouvoir se protéger des stimuli lumineux excessifs qui pourraient entraîner un stress oxydatif au niveau cellulaire en dissipant les excès. l’énergie lumineuse en chaleur. D’autre part\, les signaux lumineux provenant de l’environnement externe jouent également un rôle crucial dans la photosynthèse et ses mécanismes associés tels que le CCM et la photoprotection susmentionnés. Lorsque nous pensons au processus de photosynthèse et au CO2\, nous pensons principalement au fait que ce dernier est un substrat nécessaire au processus. Cependant\, le CO2 a également un rôle de signalisation et contrôle l’activation transcriptionnelle de la photoprotection et du CCM même en l’absence de lumière. Les mécanismes de contrôle du CO2 sont mal compris car peu étudiés. Dans ce projet\, j’étudie le rôle de signalisation du CO2 et comment il s’intègre aux signaux lumineux au niveau moléculaire chez Chlamydomonas reinhardtii. Je m’intéresse à élucider les mécanismes par lesquels le CO2 et la lumière convergent pour contrôler la photoprotection et le CCM mais aussi l’expression des gènes à l’échelle du génome. Je me concentre dans un premier temps sur le facteur nucléaire CIA5 qui agit à la croisée du CO2 et de la signalisation lumineuse. CIA5\, également connu sous le nom de CCM1\, a été initialement découvert comme régulateur principal des gènes CCM. Les travaux de notre laboratoire ont montré que CIA5 est également un régulateur clé de l’expression des gènes liés à la photoprotection. Au début de cette thèse\, j’ai mis en place des expériences pour commencer à répondre aux questions suivantes : L’expression de quels gènes\, à l’échelle du génome\, est contrôlée/affectée par le CO2 ? Quels gènes sont contrôlés uniquement par le signal lumineux ? Et quels gènes nécessitent que la lumière et le CO2 soient régulés ? Des expériences de séquençage d’ARN ont été réalisées où les algues ont été soumises à différents niveaux de CO2 et disponibilités de lumière. Les données sont analysées avec la direction et l’aide de notre collaborateur\, le Dr Zoran Nikoloski de l’Université de Potsdam. L’objectif est de créer un réseau de régulation génétique (GRN) à partir des résultats du séquençage afin de proposer des gènes candidats contrôlés par le CO2\, la lumière ou les deux. Certains des candidats seront testés en laboratoire tout au long de cette thèse en commandant des souches déficientes en gènes candidats spécifiques respectifs de la bibliothèque Chlamydomonas (bibliothèque CLiP). Les travaux de cette thèse peuvent contribuer à élargir la liste des découvertes qui élucident les rôles de signalisation réels du CO2 et de la lumière chez Chlamydomonas reinhardtii au niveau moléculaire. Cela peut profiter à la recherche menée sur d’autres sujets tels que le changement climatique et l’avenir des cultures et de la production alimentaire et du développement.​ \n_ \n\n\nATTENTION ! L’entrée d​u site CEA-Grenoble nécessite une autorisation préalable et sur présentation de votre pièce d’identité le jour de votre venue (CI ou passeport\, car le permis de conduire n’est pas recevable). Veuillez nous contacter par mail​​ \n\n\n\n\nNote: Entry to the CEA-Grenoble site requires prior authorization and the presentation of your ID on the day of your visit (ID card or passport; driver’s licenses are not accepted). Please request this authorization by​ e-mail​ URL:https://sfp-alpes.fr/event/soutenance-de-these-par-mohamad-wahidi-cea-irig-lpcv/ LOCATION:Maison Minatec – salle Chrome 1\, 3\, parvis Louis Néel\, 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: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:20261016T110000 DTEND;TZID=Europe/Paris:20261016T120000 DTSTAMP:20261015T130316Z CREATED:20261009T092313Z LAST-MODIFIED:20261015T130316Z UID:10000298-1792148400-1792152000@sfp-alpes.fr SUMMARY:ATTENTION !!! SEMINAIRE ANNULE !!! Baptiste MARTIN (Eviden) DESCRIPTION:Tensor Networks for quantum algorithms and quantum circuit simulations\nLe séminaire théorie est financé par la fédération de recherche Quantalps. \nRésumé : \nTensor networks (TNs) provide powerful tools for the classical simulation of quantum many-body systems\, while quantum computers offer a natural framework for generating and manipulating highly entangled states. With the recent advances in quantum hardware\, classical simulation has become increasingly important for understanding the capabilities of quantum devices and for developing more effective quantum algorithms. In this talk\, I will present two recent works. First\, I will discuss hybrid TN-quantum approaches and show how TN methods can improve quantum computing workflows\, enabling scalable variational ground-state preparation through warm-start circuit optimization and helping identify regimes where quantum computers may offer a computational advantage. Second\, I will focus on the classical simulation of quantum circuits and investigate alternative tensor network architectures. In particular\, I will show how Tree Tensor Networks (TTNs) can outperform standard Matrix Product States (MPS) when the network geometry more closely matches the entanglement structure generated by a quantum circuit. Together\, these results illustrate how tensor networks could both enhance near-term quantum computing and provide more efficient classical simulation strategies. \n_ \nContact : serge.florens@neel.cnrs.fr URL:https://sfp-alpes.fr/event/baptiste-martin-eviden/ 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:20261020T140000 DTEND;TZID=Europe/Paris:20261020T150000 DTSTAMP:20261009T091213Z CREATED:20261009T090939Z LAST-MODIFIED:20261009T091213Z UID:10000296-1792504800-1792508400@sfp-alpes.fr SUMMARY:James O'SULLIVAN (CEA Saclay\, Quantronics group) DESCRIPTION:Coherent interaction between individual electron spins and superconducting circuits and dispersive spin detection\nRésumé : \nSpin defects in solids can be engineered as well-isolated two-level-systems with coherence that can exceed seconds\, but couple weakly to other quantum systems and to electromagnetic fields. In the lab\, exploring quantum optical effects in the microwave regime with spin defects requires an enhancement of the light-matter interaction; this may be achieved by coupling the spin to a low-impedance superconducting resonator. I will present two recent results involving resonator design and exploration of magnetic noise-insensitive spin defects. The first is a demonstration of the dispersive shift in frequency of a superconducting resonator conditioned on the state of a single electron spin. The second is a coherent interaction between a single magnetic-noise-insensitive electron spin transition and the field of a resonator in the so-called high cooperativity regime. \n_ \nContact : equipe-seminaires-nano@listes.grenoble.cnrs.fr URL:https://sfp-alpes.fr/event/james-osullivan-cea-saclay-quantronics-group/ 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: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 END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20261102T110000 DTEND;TZID=Europe/Paris:20261102T120000 DTSTAMP:20261101T225323Z CREATED:20261101T225323Z LAST-MODIFIED:20261101T225323Z UID:10000330-1793617200-1793620800@sfp-alpes.fr SUMMARY:Arthur GOETSCHY (Institut Langevin\, ESPCI Paris) DESCRIPTION:Light\, a random walker ?\nRésumé : \nHow do waves such as light or sound propagate through fog\, paint\, or biological tissue? For decades\, this process has been described in terms of the diffusion of wave intensity. However\, this picture misses an essential ingredient: interference between distinct scattering paths. In this talk\, we will explore two situations in which interference profoundly alters wave transport. In the first part\, we will introduce a new propagation equation that describes how specially shaped waves\, such as open transmission channels created using wavefront-shaping techniques\, evolve inside scattering media. This provides access to the spatial structure of transport beyond the conventional diffusion picture. In the second part\, rather than shaping the wave\, we will shape the medium itself. We will show how strong spatial correlations can create pseudogaps and dramatically suppress wave transport\, leading to an Anderson-type transition with intriguing connection to percolation. This effect will be illustrated for vector light propagating through three-dimensional disordered media. \n_ \nContact : dorian.bouchet@univ-grenoble-alpes.fr URL:https://sfp-alpes.fr/event/arthur-goetschy-institut-langevin-espci-paris/ LOCATION:LiPhy – Salle de conférence\, LiPhy 140 avenue de la Physique\, St Martin d'Hères\, 38402\, France CATEGORIES:Séminaire END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20261103T140000 DTEND;TZID=Europe/Paris:20261103T150000 DTSTAMP:20261015T124748Z CREATED:20261015T124748Z LAST-MODIFIED:20261015T124748Z UID:10000302-1793714400-1793718000@sfp-alpes.fr SUMMARY:Buyun ZHENG (doctorant) DESCRIPTION:Physical properties and structure–property relationships in silver nanowire networks for low-emissivity applications\nRésumé : \nThe increasing demand for energy-efficient windows has stimulated the development of transparent low-emissivity (low-E) coatings capable of reducing radiative heat transfer while maintaining high visible transparency. Conventional low-E technologies\, such as metal-based multilayer structures and transparent conductive oxides\, provide high optical and infrared performance but may involve limitations related to flexibility\, processing\, or manufacturing complexity. Silver nanowire (AgNW) networks have emerged as a promising alternative owing to their low infrared emissivity\, high optical transparency\, mechanical flexibility\, and compatibility with scalable deposition processes. \nThis thesis investigates the physical properties of AgNW networks and their potential integration into low-E coatings\, with particular emphasis on structure–property relationships. The influence of key structural parameters\, including nanowire diameter\, length\, density\, and alignment\, is investigated through experimental characterization and physical analysis. In particular\, an optical percolation transition is identified at a network density well above the electrical percolation threshold\, accompanied by a transition in infrared angular emissivity from dielectric-like to metallic-like behavior. Furthermore\, dense AgNW networks are further shown to follow a generalized Hagen–Rubens relationship\, enabling infrared emissivity to be directly related to the electrical properties of the network. The impact of nanowire dimensions and network topology on low-E performance is further investigated to identify the structural parameters governing the trade-off between visible transparency and infrared emissivity. The stability of AgNW networks is also addressed through the deposition of oxide layers by spatial atomic layer deposition (SALD)\, with the aim of improving environmental and thermal stability while assessing their influence on the optical and emissive properties of the resulting coatings. Overall\, this work contributes to a more comprehensive understanding of the structure–property relationships in AgNW networks and provides physical insights into their use as transparent low-E coatings for energy-efficient applications. \nShort Bio/CV \nBuyun Zheng is a PhD student at the Laboratoire des Matériaux et du Génie Physique (LMGP).  His research focuses on the physical properties of silver nanowire (AgNW) networks and their integration into low-emissivity (low-E) coatings for energy-efficient windows. His work investigates how network structure influences the electrical\, optical\, and infrared properties of AgNW networks\, with particular interest in percolation phenomena and network topology. \n_ \nContact : deborah.verger@grenoble-inp.fr URL:https://sfp-alpes.fr/event/buyun-zheng-doctorant/ 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:20261103T140000 DTEND;TZID=Europe/Paris:20261103T150000 DTSTAMP:20261016T083835Z CREATED:20261016T083835Z LAST-MODIFIED:20261016T083835Z UID:10000311-1793714400-1793718000@sfp-alpes.fr SUMMARY:Giovanna MORIGI (Saarland University) DESCRIPTION:Searching a quantum database using noise\nRésumé : \nEfficient retrieval of information is a core operation in the world wide web\, is essential for the sustainance of living organism\, and is a paradigm for optimization. Quantum physics holds the promise for a quadratic speedup with respect to existing classical search algorithms. Achieving such speedup\, however\, requires an outstanding degree of control of the quantum dynamics of systems of large size. This implies the suppression and corrections of the errors induced by the unavoidable action of the external environment. In this talk\, we will take inspiration from foraging in nature\, which results from the interplay of deterministic dynamics and stochasticity\, and discuss examples of quantum search dynamics emerging from the interplay between quantum coherent processes and the action of an external reservoir. We will discuss how these insights can contribute to our understanding of out-of-equilibrium dynamics in the quantum world and of the mechanisms of their stabilization\, and how they could pave the way for a novel class of robust quantum algorithms. \n_ \nContact : sergey.skipetrov@lpmmc.cnrs.fr URL:https://sfp-alpes.fr/event/giovanna-morigi-saarland-university/ LOCATION:CNRS – Bâtiment A\, CNRS - Institut Néel 25 avenue des Martyrs\, Grenoble\, 38054\, France CATEGORIES:Séminaire END:VEVENT END:VCALENDAR