Spatial correlations of elementary relaxation events in glass-forming liquids

Abstract

The dynamical facilitation scenario, by which localized relaxation events promote nearby relaxation events in an avalanching process, has been suggested as the key mechanism connecting the microscopic and the macroscopic dynamics of structural glasses. Here we investigate the statistical features of this process via the numerical simulation of a model structural glass. First we show that the relaxation dynamics of the system occurs through particle jumps that are irreversible, and that cannot be decomposed in smaller irreversible events. Then we show that each jump does actually trigger an avalanche. The characteristic of this avalanche change on cooling, suggesting that the relaxation dynamics crossovers from a noise dominated regime where jumps do not trigger other relaxation events, to a regime dominated by the facilitation process, where a jump trigger more relaxation events.

8 pages, 6 figures

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• Diffusion dynamics of supercooled water modeled with the cage-jump motion and hydrogen-bond rearrangement
• Local Plastic Response and Slow Heterogeneous Dynamics of Supercooled Liquids
• Concentrated suspensions of Brownian beads in water: dynamic heterogeneities trough a simple experimental technique
• Temperature dependence of the transition packing fraction of thermal jamming in a harmonic soft sphere system
• Relaxation functions and dynamical heterogeneities in a model of chemical gel interfering with glass transition
• Jump Events in a 3D Edwards-Anderson Spin Glass