Dynamic heterogeneity and non-Gaussian behavior in a model supercooled liquid
arXiv:cond-mat/0506608 · doi:10.1088/0953-8984/17/49/002
Abstract
We use a recently-derived reformulation of the diffusion constant [Stillinger F H and Debenedetti P G 2005 J. Phys. Chem. B 109 6604] to investigate heterogeneous dynamics and non-Gaussian diffusion in a binary Lennard-Jones mixture. Our work focuses on the joint probability distribution of particles with velocity v_0 at time t=0 and eventual displacement Delta x at time t=Delta t. We show that this distribution attains a distinctive shape at the time of maximum non-Gaussian behavior in the supercooled liquid. By performing a two-Gaussian fit of the displacement data, we obtain, in a non-arbitrary manner, two diffusive length scales inherent to the supercooled liquid and use them to identify spatially separated regions of mobile and immobile particles.
15 pages, 5 figures
References in corpus (15)
- Testing Mode-Coupling Theory for a Supercooled Binary Lennard-Jones Mixture I: The van Hove Correlation Function
- Dynamical heterogeneities in a supercooled Lennard-Jones liquid
- String-like Clusters and Cooperative Motion in a Model Glass-Forming Liquid
- Scaling behavior in the -relaxation regime of a supercooled Lennard-Jones mixture
- Spatial Correlations of Mobility and Immobility in a Glassforming Lennard-Jones Liquid
- Geometrical explanation and scaling of dynamical heterogeneities in glass forming systems
- Coarse-grained microscopic model of glass formers
- Heterogeneous Diffusion in Highly Supercooled Liquids
- Energy Barriers and Activated Dynamics in a Supercooled Lennard-Jones Liquid
- Length scale for the onset of Fickian diffusion in supercooled liquids
- Connection between Adam-Gibbs Theory and Spatially Heterogeneous Dynamics
- Spatially heterogeneous dynamics and dynamic facilitation in a model of viscous silica
- Particle rearrangements during transitions between local minima of the potential energy landscape of a supercooled Lennard-Jones liquid
- Molecular Dynamics Study of Long-Lived Structures in a Fragile Glass Forming Liquid
- Potential Energy Landscape in Lennard-Jones binary mixture model
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