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DTSTART;TZID=Europe/Paris:20261013T110000
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DTSTAMP:20261009T093111Z
CREATED:20261009T093111Z
LAST-MODIFIED:20261009T093111Z
UID:10000299-1791889200-1791892800@sfp-alpes.fr
SUMMARY:Sarah LYON-CAEN & Claire PHILIPPAT (IAB\, Grenoble\, France)
DESCRIPTION:Leviers pour diminuer son exposition aux polluants chimiques\, l’exemple des produits de soin et cosmétiques\nRésumé : \nUtiliser moins de produits cosmétiques et de soin peut réduire rapidement l’exposition à plusieurs substances chimiques incluant des perturbateurs endocriniens avérés ou suspectés\, selon une étude publiée Environment International par des chercheurs de l’IAB. Menée auprès d’une centaine d’étudiantes\, cette étude montre que diminuer le nombre de produits cosmétiques et de soin utilisés et recourir à des alternatives exemptes de plusieurs composés suspectés d’être d’avoir des effets néfastes sur la santé (dont le méthylparabène et certains phtalates) s’accompagne d’une baisse des concentrations urinaires de ces substances en seulement cinq jours. Une diminution de la concentration du bisphénol A est également observée. Cette substance\, classée par l’Union européenne comme « très préoccupante »\, est un perturbateur endocrinien avéré et reprotoxique présumé. Pour la première fois dans ce type d’étude\, les chercheurs\, en lien avec le laboratoire Grenoblois GAEL\, ont réalisé une évaluation d’impact en santé\, visant à estimer les bénéfices potentiels\, sanitaires et économiques\, d’un tel changement de routine cosmétique à l’échelle de la population. \nCette présentation à deux voix reviendra sur les résultats de cette étude et présentera les autres initiatives en cours visant à identifier les leviers pour limiter les expositions aux polluants chimiques en population générale. \n_ \nContact : appaixfl@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/sarah-lyon-caen-claire-philippat-iab-grenoble-france/
LOCATION:IAB – Salle de séminaire\, IAB Site Santé - Allée des Alpes\, La Tronche\, 38700\, France
CATEGORIES:Séminaire
ORGANIZER;CN="IAB":MAILTO:appaixfl@univ-grenoble-alpes.fr
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
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