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Center for Nonlinear Studies |
We examine dynamical heterogeneities in simulations of a two-dimensional system of interacting particles, which will help us understand the dynamic behaviour of glasses. Each site of a triangular particle lattice is pinned with some probability, and pinning sites are modeled as parabolic traps. We measure the fraction of particles having six nearest neighbors P_6, the noise power S_0, and the diffusion coefficient D as a function of temperature with different pinning densities. Just above the solid to liquid transition temperature, these quantities change dramatically and show heterogeneous dynamics between regions with pinned particles and those with unpinned particles.