G Marty

Publications (2)14.74 Total impact

• Source

  Available from: Olivier Dauchot

  Article: Dynamical heterogeneity close to the jamming transition in a sheared granular material.

  O Dauchot, G Marty, G Biroli
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  ABSTRACT: The dynamics of a bidimensional dense granular packing under cyclic shear is experimentally investigated close to the jamming transition. Measurement of multipoint correlation functions are produced. The self-intermediate scattering function, displaying slower than exponential relaxation, suggests dynamic heterogeneity. Further analysis 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 a spatiotemporal pattern of mobility. Our experimental results open the way to a systematic study of dynamic correlation functions in granular materials.
  Physical Review Letters 01/2006; 95(26):265701. · 7.37 Impact Factor
• Source

  Available from: Olivier Dauchot

  Article: Subdiffusion and cage effect in a sheared granular material.

  G Marty, O Dauchot
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  ABSTRACT: We investigate experimentally the diffusion properties of a bidimensional bidisperse dry granular material under quasistatic cyclic shear. The comparison of these properties with results obtained both in computer simulations of hard spheres systems and Lennard-Jones liquids and experiments on colloidal systems near the glass transition demonstrates a strong analogy between the statistical behavior of granular matter and these systems, despite their intrinsic microscopic differences (thermal vs athermal). More specifically, we study in detail the cage dynamics responsible for the subdiffusion in the slow relaxation regime, and obtain the values of relevant time and length scales.
  Physical Review Letters 02/2005; 94(1):015701. · 7.37 Impact Factor