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Crossover from Intermittent to Continuum Dynamics for Locally Driven Colloids | | C. Reichhardt
; C.J. Olson Reichhardt
; | | Date: |
7 May 2005 | | Subject: | Soft Condensed Matter; Statistical Mechanics | cond-mat.soft cond-mat.stat-mech | | Abstract: | 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. | | Source: | arXiv, cond-mat/0505174 | | Services: | Forum | Review | PDF | Favorites | |
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