Heterogeneities in the Glassy State

Abstract

We study heterogeneities in a binary Lennard-Jones system below the glass transition using molecular dynamics simulations. We identify mobile and immobile particles and measure their distribution of vibrational amplitudes. For temperatures near the glass transition the distribution of vibrational amplitudes obeys scaling and compares reasonably well with a mean field theory for the amorphous solid state. To investigate correlations among the immobile and mobile particles we identify clusters and analyze their size and shape. For a fixed number of immobile particles we observe that the immobile particles cluster more strongly together as the temperature is increased which allows the particles to block each other more effectively, and to therefore stay immobile. For the mobile particles, on the other hand, the clustering is most pronounced at small temperatures, indicating that mobility at low temperatures can only be sustained in cooperative motion.

9 pages, 15 figures

References in corpus (6)

• Dynamical Heterogeneities Below the Glass Transition
• Particle rearrangements during transitions between local minima of the potential energy landscape of a supercooled Lennard-Jones liquid
• Temperature dependence of spatially heterogeneous dynamics in a model of viscous silica
• Single Particle Jumps in a Binary Lennard-Jones System Below The Glass Transition
• Percolation of Immobile Domains in Supercooled Thin Polymeric Films
• Towards finite-dimensional gelation

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• Simulations of aging and plastic deformation in polymer glasses
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• Deformation-induced accelerated dynamics in polymer glasses
• Atomistic mechanism of physical ageing in glassy materials
• Aging in attraction-driven colloidal glasses
• Spatial correlations of elementary relaxation events in glass-forming liquids
• Self-Organized Criticality Below The Glass Transition
• Signatures of Dynamical Heterogeneity in the Structure of Glassy Free-energy Minima
• Realistic Tunneling States for the Magnetic Effects in Non-Metallic Real Glasses
• Effect of liquid state organization on microstructure and strength of model multicomponent solids
• Dynamical heterogeneities in an attraction driven colloidal glass
• Modification of the aging dynamics of glassy polymers due to a temperature step
• Evidence for compact cooperatively rearranging regions in a supercooled liquid