Dresden 2011 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 22: Granular Matter/ Contact Dynamics

DY 22.14: Talk

Wednesday, March 16, 2011, 17:30–17:45, HÜL 186

Superdiffusive, heterogeneous, and collective particle motion near the jamming transition in athermal disordered materials — •Claus Heussinger¹, Ludovic Berthier², and Jean-Louis Barrat³ — ¹Institute for Theoretical Physics, University of Goettingen, Germany — ²LCVN, Univ. Montpellier 2, France — ³LPMCN, Univ. Lyon I, France

Many materials, from emulsions and suspensions to foams and granular materials are dense assemblies of non-Brownian particles. In these systems a fluid-to-solid "jamming" transition can be observed when the particle volume fraction is increased beyond a critical value. In this contribution, we use computer simulations to study the microscopic dynamics of an assembly of soft, frictionless particles near their jamming transition. We observe superdiffusive, spatially heterogeneous, and collective particle motion over a characteristic scale which displays a surprising non-monotonic behavior across the transition. Establishing a connection between single particle dynamics and collective particle motion, we develop an intuitive and appealing picture of jamming as the consequence of the diverging size of rigid particle clusters.