Front-Mediated Melting of Isotropic Ultrastable Glasses.
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2019-10
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Ultrastable vapor-deposited glasses display uncommon material properties. Most remarkably, upon heating they are believed to melt via a liquid front that originates at the free surface and propagates over a mesoscopic crossover length, before crossing over to bulk melting. We combine swap Monte Carlo with molecular dynamics simulations to prepare and melt isotropic amorphous films of unprecedendtly high kinetic stability. We are able to directly observe both bulk and front melting, and the crossover between them. We measure the front velocity over a broad range of conditions, and a crossover length scale that grows to nearly 400 particle diameters in the regime accessible to simulations. Our results disentangle the relative roles of kinetic stability and vapor deposition in the physical properties of stable glasses.
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Flenner, Elijah, Ludovic Berthier, Patrick Charbonneau and Christopher J Fullerton (2019). Front-Mediated Melting of Isotropic Ultrastable Glasses. Physical review letters, 123(17). p. 175501. 10.1103/physrevlett.123.175501 Retrieved from https://hdl.handle.net/10161/24989.
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Patrick Charbonneau
Professor Charbonneau studies soft matter. His work combines theory and simulation to understand the glass problem, protein crystallization, microphase formation, and colloidal assembly in external fields.
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