Dresden 2014 – scientific programme
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BP: Fachverband Biologische Physik
BP 18: Complex Fluids and Soft Matter (joint DY/CPP/BP)
BP 18.5: Talk
Tuesday, April 1, 2014, 10:45–11:00, ZEU 118
Random Organization and Jamming within a unifying model system — •Lars Milz1 and Michael Schmiedeberg2 — 1Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany — 2Institut für Theoretische Physik 2: Weiche Materie, Heinrich-Heine-Universität Düsseldorf, D-40204 Düsseldorf, Germany
We show that both random organization and jamming occur within the same model packing problem despite the obvious differences between these two transitions: The random organization transition describes the change from reversible to irreversible dynamics in a non-equilibrium system and the athermal jamming transition occurs when particles can no longer avoid overlaps if quenched from infinite to zero temperature.
In our unifying model system the particles are initially randomly distributed and then displaced in each step if they overlap. For random displacements we obtain a random organization transition while jamming occurs in case of deterministic shifts. For the random organization transition, we also determine the critical exponents. For the jamming transition we observe a divergence of the relaxation time of our method.
Within our model system, random organization and jamming are opposite limits of random sphere packings. In future, we want to study intermediate packing problems or mixtures or random organization and jamming that probably correspond to other equilibrium or non-equilibrium transitions.