Publication : t05/119
Dynamical heterogeneity close to the jamming transition in a sheared granular material
Dauchot O. (CEA, IRAMIS, SPEC (Service de Physique de lEtat Condensé), F-91191 Gif-sur-Yvette, FRANCE)Marty G. (CEA, IRAMIS, SPEC (Service de Physique de lEtat Condensé), F-91191 Gif-sur-Yvette, FRANCE)
Biroli G. (CEA, DSM, SPhT (Service de Physique Théorique), F-91191 Gif-sur-Yvette, FRANCE)
Abstract:Année de publication : 2005
The dynamics of a bi-dimensional dense granular packing under cyclic shear is experimentally investigated close to the jamming transition. Measurement of multi-point correlation functions are produced. The intermediate scattering function and its self-part, displaying slower than exponential relaxation, suggest dynamic heterogeneity. Further analyses of four point correlation functions reveal that the grain relaxations are strongly correlated and spatially heterogeneous, especially at the time scale of the collective rearrangements. Finally, a dynamical correlation length is extracted from spatio-temporal pattern of mobility. Our experimental results open the way to a systematic study of dynamic correlation functions in granular materials.
Revue : Phys. Rev. Lett. 95 265701 (2005)
DOI : 10.1103/PhysRevLett.95.265701
Preprint : arXiv:cond-mat/0507152
Lien : http://link.aps.org/abstract/PRL/v95/p265701
PACS : 64.70.Pf, 05.40.Ca, 45.70Cc, 61.43.Fs
Numéro Exterieur : SPEC-S05/059
Langue : Anglais
Fichier(s) à télécharger :
publi.pdf
