Dynamic facilitation explains democratic particle motion of metabasin transitions
arXiv:0706.0902 · doi:10.1088/1751-8113/41/32/324006
Abstract
Transitions between metabasins in supercooled liquids seem to occur through rapid "democratic" collective particle rearrangements. Here we show that this apparent homogeneous particle motion is a direct consequence of dynamic facilitation. We do so by studying metabasin transitions in facilitated spin models and constrained lattice gases. We find that metabasin transitions occur through a sequence of locally facilitated events taking place over a relatively short time frame. When observed on small enough spatial windows these events appear sudden and homogeneous. Our results indicate that metabasin transitions are essentially "non-democratic" in origin and yet another manifestation of dynamical heterogeneity in glass formers.
6 pages, 6 figures
References in corpus (16)
- Glassy dynamics of kinetically constrained models
- Geometrical explanation and scaling of dynamical heterogeneities in glass forming systems
- Dynamic first-order phase transition in kinetically constrained models of glasses
- Space-time Thermodynamics of the Glass Transition
- Energy Barriers and Activated Dynamics in a Supercooled Lennard-Jones Liquid
- Democratic particle motion for meta-basin transitions in simple glass-formers
- Glassy timescale divergence and anomalous coarsening in a kinetically constrained spin chain
- Spatial structures and dynamics of kinetically constrained models for glasses
- Heterogeneity and growing lengthscales in the dynamics of kinetically constrained lattice gases in two dimensions
- Non-topographic description of inherent structure dynamics in glass formers
- On the relationship between structure and dynamics in a supercooled liquid
- Aging in lattice-gas models with constrained dynamics
- Spatial correlations in the relaxation of the Kob-Andersen model
- Dynamical arrest, tracer diffusion and Kinetically Constrained Lattice Gases
- Geometry of Empty Space is the Key to Near-Arrest Dynamics
- Dynamic propensity in a kinetically constrained lattice gas