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DTSTART;TZID=Europe/Paris:20260511T110000
DTEND;TZID=Europe/Paris:20260511T120000
DTSTAMP:20260618T145234
CREATED:20260507T130104Z
LAST-MODIFIED:20260507T130124Z
UID:10000150-1778497200-1778500800@sfp-alpes.fr
SUMMARY:Hamid KELLAY (Laboratoire Ondes et Matière d'Aquitaine\, Bordeaux)
DESCRIPTION:From active particles to flexible\, deformable\, and motile superstructures : a new type of soft robot of robots\nRésumé : \nWe study assemblies of rodlike robots made motile through self-vibration. When confined by circular scaffolds\, dilute assemblies of these rods act as a 2D gas of particles. Above a critical surface fraction\, some of the bots line up in one or more tight clusters along the corral boundary while\, in the bulk\, gas-like behavior is retained. We find that the unified pushing of the clustered bots on the boundary can drive collective motion: by selecting corrals that are deformable but free to move\, we take advantage of surface cluster formation to force the robots to work together. The deformability of the arena allows the assembly to go through narrow slits or to circumvent obstacles. Simple tasks such as pulling a load\, moving through an obstacle course\, or cleaning up an arena are demonstrated. Rudimentary control of these superstructures (robots+scaffold) using light is also proposed. \n_ \nContact : jean-louis.barrat@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/hamid-kellay-laboratoire-ondes-et-matiere-daquitaine-bordeaux/
LOCATION:LiPhy\, Salle de Conférence\, 140 rue de la Physique\, St Martin d'Hères\, 38400
CATEGORIES:Séminaire
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DTSTART;TZID=Europe/Paris:20260511T140000
DTEND;TZID=Europe/Paris:20260511T150000
DTSTAMP:20260618T145234
CREATED:20260424T124347Z
LAST-MODIFIED:20260424T124347Z
UID:10000132-1778508000-1778511600@sfp-alpes.fr
SUMMARY:Bo PENG (Cavendish Laboratory\, University of Cambridge)
DESCRIPTION:Designing molecular quantum materials from first principles\nRésumé : \nQuantum materials provide the basic building blocks for quantum hardware\, but it remains challenging to design robust\, tuneable and scalable material platforms. In this talk\, I will present strategies for engineering quantum materials based on molecular building blocks using first principles calculations. Molecules provide more tuneable building blocks than atoms [1\,2]\, which can self-assemble into larger structures [3\,4] with richer structural behaviours [5] for practical quantum devices. Using pure-carbon fullerene molecules that were believed to be non-magnetic [6]\, we show that magnetism in this material family can be induced purely by symmetry [7]. We can then use this pure-carbon magnetic material to design various quantum platforms\, based on experimentally synthesised monolayers [8\,9]\, to realise exotic quantum phenomena such as ferromagnetic Chern insulators [10]\, antiferromagnetic spin chain [11]\, altermagnetism and quantum spin liquid [12]\, as well as magnetoelectrics where spins can be controlled by electric fields. If time allows\, I will also discuss my ongoing research that combines both atomic and molecular building blocks. With this approach\, we can unlock even more exciting applications such as portable quantum timekeeping\, robust quantum sensing\, and programmable quantum simulations.\n\nReferences:\n[1] BP*. Journal of the American Chemical Society 144\, 19921 (2022).\n[2] J. Wu & BP*. Journal of the American Chemical Society 147\, 1749 (2025).\n[3] BP*. Nano Letters 23\, 652 (2023).\n[4] BP* & M. Pizzochero*. ACS Nano 19\, 29637 (2025).\n[5] A. Shaikh\, J. Wu & BP*. Physical Review Letters 135\, 126103 (2025).\n[6] T. L. Makarova\, et al. Nature 413\, 716 (2001) [Retracted].\n[7] J. Wu\, L. W. Pingen\, T. K. Dickens & BP*. arXiv:2508.18125.\n[8] L. Hou\, et al. Nature 606\, 507 (2022).\n[9] E. Meirzadeh\, et al. Nature 613\, 71 (2023).\n[10] L. W. Pingen\, J. Wu & BP*. arXiv:2508.19849. [Physical Review Letters\, in revision]\n[11] BP* & M. Pizzochero*. arXiv:2508.18849. [Nano Letters\, in press]\n[12] J. Wu\, A. Sanders\, R. Yuan & BP*. arXiv:2508.21056.\n\n_\n\nContact : andrew.fefferman@neel.cnrs.fr
URL:https://sfp-alpes.fr/event/bo-peng-cavendish-laboratory-university-of-cambridge/
LOCATION:CNRS – Salle Louis Weil (E424)\, CNRS - Institut Néel 25 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
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