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  Strong dynamical heterogeneity and universal scaling in driven granular fluids

Avila, K. E., Castillo, H. E., Fiege, A., Vollmayr-Lee, K., & Zippelius, A. (2014). Strong dynamical heterogeneity and universal scaling in driven granular fluids. Physical Review Letters, 113: 025701. doi:10.1103/PhysRevLett.113.025701.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-0F25-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-0F26-D
Genre: Journal Article

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 Creators:
Avila, Karina E.1, Author
Castillo, Horacio E., Author
Fiege, Andrea, Author
Vollmayr-Lee, Katharina, Author
Zippelius, Annette2, Author              
Affiliations:
1Max Planck Society, ou_persistent13              
2Fellow Group Polymers, complex fluids and disordered systems, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063298              

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 Abstract: 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.

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Language(s): eng - English
 Dates: 2014-07-10
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 697899
DOI: 10.1103/PhysRevLett.113.025701
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Title: Physical Review Letters
Source Genre: Journal
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Pages: - Volume / Issue: 113 Sequence Number: 025701 Start / End Page: - Identifier: -