Regensburg 2013 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 17: Soft matter
DY 17.2: Vortrag
Mittwoch, 13. März 2013, 10:15–10:30, H47
Model System for the Random Organization and Jamming Transition — •Lars Milz1,2 and Michael Schmiedeberg2 — 1Universität Regensburg, 93053 Regensburg, Germany — 2Institut für Theoretische Physik 2: Weiche Materie, Heinrich-Heine-Universität Düsseldorf, 40204 Düsseldorf, Germany
Random organization is a non-equilibrium phase transition between a steady state and an absorbing state. This transition was observed in a system with periodically sheared non-Brownian particles where at low densities or low shear amplitudes the particle organize such that collisions are avoided while at large densities or large shear amplitudes collisions still occur [1,2]. We consider a simplified model system without shear where in each step particles are displaced if they overlap. For displacements in random directions we observe the random organization transition and explain how the shear amplitude and density in [1,2] can be mapped onto the packing fraction, which is our only control parameter. Interestingly, for deterministic displacements we find crystallization in 2D and the jamming transition in 3D. Therefore, our model system provides a simple method to study the random organization transition and a link between this non-equilibrium transition and the jamming transition.
[1] D.J. Pine et al., Nature 438, 997(2005).
[2] L. Corté et al., Nature Physics 4, 420 (2008).