Superdiffusive, heterogeneous, and collective particle motion near the jamming transition in athermal disordered materials Auteur(s): Heussinger Claus, Berthier L., Barrat Jean-Louis (Article) Publié: Europhysics Letters (Epl), vol. 86 p.10001 (2009) Texte intégral en Openaccess : Ref HAL: hal-00444459_v1 Ref Arxiv: 1001.0914 DOI: 10.1209/0295-5075/90/20005 WoS: 000279119000005 Ref. & Cit.: NASA ADS Exporter : BibTex | endNote 59 Citations Résumé: We use computer simulations to study the microscopic dynamics of an athermal assembly of soft particles near the fluid-to-solid, jamming transition. Borrowing tools developed to study dynamic heterogeneity near glass transitions, we discover a number of original signatures of the jamming transition at the particle scale. We observe superdiffusive, spatially heterogeneous, and collective particle motion over a characteristic scale which displays a surprising non-monotonic behavior across the transition. In the solid phase, the dynamics is an intermittent succession of elastic deformations and plastic relaxations, which are both characterized by scale-free spatial correlations and system size dependent dynamic susceptibilities. Our results show that dynamic heterogeneities in dense athermal systems and glass-formers are very different, and shed light on recent experimental reports of `anomalous' dynamical behavior near the jamming transition of granular and colloidal assemblies. |