Crossover from Intermittent to Continuum Dynamics for Locally Driven Colloids

Details Crossover from Intermittent to Continuum Dynamics for Locally Driven Colloids Crossover from Intermittent to Continuum Dynamics for Locally Driven Colloids

2005-05-06

arxiv.org/abs/cond-mat/0505174v2

Phys. Rev. Lett. 96, 028301 (2006)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 5 postscript figures. Version to appear in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.96.028301

We simulate a colloid with charge q_d driven through a disordered assembly of interacting colloids with charge q and show that, for q_d \approx q, the velocity-force relation is nonlinear and the velocity fluctuations of the driven particle are highly intermittent with a 1/f characteristic. When q_d >> q, the average velocity ddrops, the velocity force relation becomes linear, and the velocity fluctuations are Gaussian. We discuss the results in terms of a crossover from strongly intermittent heterogeneous dynamics to continuum dynamics. We also make several predictions for the transient response in the different regimes.

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