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Glass films created by vapor-depositing molecules onto a substrate canexhibit properties similar to those of ordinary glasses aged for thousands ofyears. It is believed that enhanced surface mobility is the mechanism thatallows vapor deposition to create such exceptional glasses, but it is unclearhow this effect is related to the final state of the film. Here we usemolecular dynamics simulations to model vapor deposition and an efficient MonteCarlo algorithm to determine the deposition rate needed to create ultra-stableglassy films. We obtain a scaling relation that quantitatively captures theefficiency gain of vapor deposition over bulk annealing, and demonstrates thatsurface relaxation plays the same role in the formation of vapor-depositedglasses as bulk relaxation does in ordinary glass formation.

Origin of ultrastability in vapor-deposited glasses