Relaxation in yield stress systems through elastically interacting activated events
arXiv:1407.8014 · doi:10.1103/PhysRevLett.113.248301
Abstract
We study consequences of long-range elasticity in thermally assisted dynamics of yield stress materials. Within a two-dimensinal mesoscopic model we calculate the mean-square displacement and the dynamical structure factor for tracer particle trajectories. The ballistic regime at short time scales is associated with a compressed exponential decay in the dynamical structure factor, followed by a subdiffusive crossover prior to the onset of diffusion. We relate this crossover to spatiotemporal correlations and thus go beyond established mean field predictions.
5 pages, 2 figures, to appear in PRL
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