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ID: 697899.0, MPI für Dynamik und Selbstorganisation / Max-Planck-Fellow Zippelius
Strong dynamical heterogeneity and universal scaling in driven granular fluids
Authors:Avila, Karina E.; Castillo, Horacio E.; Fiege, Andrea; Vollmayr-Lee, Katharina; Zippelius, Annette
Language:English
Date of Publication (YYYY-MM-DD):2014-07-10
Title of Journal:Physical Review Letters
Volume:113
Sequence Number of Article:025701
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Large-scale simulations of two-dimensional bidisperse granular fluids allow us to determine spatial correlations of slow particles via the four-point structure factor S4(q,t). Both cases, elastic (ϵ=1) and inelastic (ϵ<1) collisions, are studied. As the fluid approaches structural arrest, i.e., for packing fractions in the range 0.6≤ϕ≤0.805, scaling is shown to hold: S4(q,t)/χ4(t)=s(qξ(t)). Both the dynamic susceptibility χ4(τα) and the dynamic correlation length ξ(τα) evaluated at the α relaxation time τα can be fitted to a power law divergence at a critical packing fraction. The measured ξ(τα) widely exceeds the largest one previously observed for three-dimensional (3d) hard sphere fluids. The number of particles in a slow cluster and the correlation length are related by a robust power law, χ4(τα)≈ξd−p(τα), with an exponent d−p≈1.6. This scaling is remarkably independent of ϵ, even though the strength of the dynamical heterogeneity at constant volume fraction depends strongly on ϵ.
External Publication Status:published
Document Type:Article
Communicated by:Folkert Mueller-Hoissen
Affiliations:MPI für Dynamik und Selbstorganisation/Max-Planck-Fellow Zippelius
External Affiliations:Department of Physics and Astronomy and Nanoscale and Quantum Phenomena Institute, Ohio University, Athens, Ohio 45701, USA

Institut für Theoretische Physik, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany

Department of Physics and Astronomy, Bucknell University, Lewisburg, Pennsylvania 17837, USA
Identifiers:DOI:http://dx.doi.org/10.1103/PhysRevLett.113.025701
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