Sommaire:

Glass films created by vapor depositing particles onto a properly prepared substrate have properties similar to those of ordinary glasses aged for thousands of years. It has been a challenge to study these glasses using computer simulations due to the long time scales involved. Here we use computer simulations to examine two aspects of vapor deposited glasses. First, we examine the role of surface mobility on the creation of ultra-stable vapor deposited glasses. We show that the surface mobility plays the same role in creating vapor deposited glasses as the bulk mobility does for glasses cooled at a constant rate. Second, we examine the melting of stable glasses. Vapor deposited glasses can melt via a front initiated at the surface, while this melting mechanism is not observed for liquid cooled glasses. We use the swap Monte Carlo algorithm to create stable glasses and examine the conditions where the glasses melt via a front versus a bulk mechanism. We also examine what controls the front velocity.

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