Evolution of dynamical facilitation approaching the granular glass transition

Details Evolution of dynamical facilitation approaching the granular glass transition Evolution of dynamical facilitation approaching the granular glass transition

2009-12-02

arxiv.org/abs/0912.0472v1

EPL 92 (2010) 24003

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 4 figures

Scientific paper

We investigate the relaxation dynamics of a dense monolayer of bidisperse beads by analyzing the experimental data previously obtained in a fluidized bed. We show that the dynamics is formed by elementary relaxation events called cage jumps. These aggregate on a very short time into clusters. Increasing the packing fraction makes the spatio-temporal organization of the clusters evolve from a rather scattered and random distribution towards a collection of sparse and large events, called avalanches. The avalanche process is a manifestation of dynamical facilitation. The study of its evolution with density reveals that dynamical facilitation becomes less conserved and play a lesser role for the structural relaxation approaching the granular glass transition.

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