Density controls the kinetic stability of ultrastable glasses

Abstract

We use a swap Monte Carlo algorithm to numerically prepare bulk glasses with kinetic stability comparable to that of glass films produced experimentally by physical vapor deposition. By melting these systems into the liquid state, we show that some of our glasses retain their amorphous structures longer than 10^5 times the equilibrium structural relaxation time. This exceptional kinetic stability cannot be achieved experimentally for bulk materials. We perform simulations at both constant volume and constant pressure to demonstrate that the density mismatch between the ultrastable glass and the equilibrium liquid accounts for a major part of the observed kinetic stability.

7 Pages, 6 Figures. Figures 4b) and 5b) updated, revisions to text to improve discussion, missing page numbers added to references, typos corrected

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• Front propagation in ultrastable glasses is dynamically heterogeneous
• Structural signatures of ultrastability in a deposited glassformer
• Stable glassy configurations of the Kob-Andersen model using swap Monte Carlo
• Dynamical Facilitation Governs the Equilibration Dynamics of Glasses
• Ductile and brittle yielding of athermal amorphous solids: a mean-field paradigm beyond the random field Ising model
• Initial Stages of Rejuvenation of Vapor-Deposited Glasses during Isothermal Annealing: Contrast Between Experiment and Simulation
• Computational Methods toward Ultrastable Glasses