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20 septembre 2021: 1 événement

  • Séminaires Invités

    Lundi 20 septembre 14:00-15:30 - Misaki Ozawa - Ecole Normale Supérieure

    Entropy crisis and ideal glass transition in supercooled liquids

    Résumé : One of the central problems in glass science is understanding the mechanism behind the dramatic slowing down of supercooled liquids approaching the kinetic glass transition. One possible scenario assumes the existence of a genuine thermodynamic "ideal glass transition" and that its singularity causes the divergence of relaxation times. Proving or disproving this scenario is extremely difficult as it involves some paradoxical situations such as the Kauzman’s paradox or entropy crisis. Besides, standard experiments and computer simulations fail to approach the putative ideal glass transition temperature due to ever-growing sluggishness. ,We tackle this fundamental problem by using advanced computer simulation techniques. In particular, we develop efficient simulation schemes : i) Random pinning : This approach induces an ideal glass transition by freezing the positions of randomly selected particles permanently. We demonstrated this idea computationally and sampled an ideal glass state through the combination with parallel tempering simulations. ii) Swap Monte-Carlo (MC) algorithm : We studied an extremely efficient simulation scheme applying particle-swap MC updates for models with continuous size polydispersity. This scheme is more than ten orders of magnitude efficient than the standard MC simulations and allows us to investigate extremely deep supercooled liquid states relevant for the ideal glass transition. 

    contact : Kirsten Martens

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