Publication : t09/230
The building blocks of dynamical heterogeneities in dense granular media
Candelier R. (CEA, IRAMIS, SPEC (Service de Physique de lEtat Condensé), F-91191 Gif-sur-Yvette, FRANCE)Dauchot O. (CEA, IRAMIS, SPEC (Service de Physique de lEtat Condensé), F-91191 Gif-sur-Yvette, FRANCE)
Biroli G. (CEA, IPhT (Institut de Physique Théorique), F-91191 Gif-sur-Yvette, France)
Abstract:Année de publication : 2009
We investigate experimentally the connection between short time dynamics and long time dynamical heterogeneities within a dense granular media under cyclic shear. We show that dynamical heterogeneities result from a two timescales process. Short time but already collective events consisting in clustered cage jumps concentrate most of the non affine displacements. On larger timescales such clusters appear aggregated both temporally and spatially in avalanches which eventually build the large scales dynamical heterogeneities. Our results indicate that facilitation plays an important role in the relaxation process although it does not appear to be conserved as proposed in many models studied in the literature.
Revue : Phys. Rev. Lett. 102 088001 (2009)
DOI : 10.1103/PhysRevLett.102.088001
Preprint : arXiv:0811.0201
Lien : http://link.aps.org/doi/10.1103/PhysRevLett.102.088001
PACS : 45.70.Mg; 45.70.Ht; 61.43.-j
Langue : Anglais
Fichier(s) à télécharger :
publi.pdf
