Emergent facilitation behavior in a distinguishable-particle lattice model of glass

Abstract

We propose an interacting lattice gas model of structural glass characterized by particle distinguishability and site-particle-dependent random nearest-neighboring particle interactions. This incorporates disorder quenched in the configuration space rather than in the physical space. The model exhibits non-trivial energetics while still admitting exact equilibrium states directly constructible at arbitrary temperature and density. The dynamics is defined by activated hopping following standard kinetic Monte Carlo approach without explicit facilitation rule. Kinetic simulations show emergent dynamic facilitation behaviors in the glassy phase in which motions of individual voids are significant only when accelerated by other voids nearby. This provides a microscopic justification for the dynamic facilitation picture of structural glass.

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• Deeper penetration of surface effects on particle mobility than on hopping rate in glassy polymer films
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• Kovacs Effect in Glass with Material Memory Revealed in Non-Equilibrium Particle Interactions
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• Surface mobility gradient and emergent facilitation in glassy films
• The distinguishable-particle lattice model of glasses in three dimensions
• Ergodicity breaking of an inorganic glass in aging near $T_g$ probed by elasticity relaxation