Brownian particles on rough substrates: Relation between the intermediate subdiffusion and the asymptotic long-time diffusion

Abstract

Brownian particles in random potentials show an extended regime of subdiffusive dynamics at intermediate times. The asymptotic diffusive behavior is often established at very long times and thus cannot be accessed in experiments or simulations. For the case of one-dimensional random potentials with Gaussian distributed energies, we present a detailed analysis of experimental and simulation data. It is shown that the asymptotic long-time diffusion coefficient can be related to the behavior at intermediate times, namely the minimum of the exponent that characterizes subdiffusion and hence corresponds to the maximum degree of subdiffusion. As a consequence, investigating only the dynamics at intermediate times is sufficient to predict the order of magnitude of the long-time diffusion coefficient and the timescale at which the crossover from subdiffusion to diffusion occurs, i.e. when the long-time diffusive regime and hence thermal equilibrium is established.

7 pages, 3 figures

References in corpus (6)

• Anomalous transport in the crowded world of biological cells
• Random walk with barriers: Diffusion restricted by permeable membranes
• Confocal microscopy of colloidal particles: towards reliable, optimum coordinates
• Colloids in light fields: particle dynamics in random and periodic energy landscapes
• Colloidal suspensions in modulated light fields
• Effect of correlated noise on quasi-1D diffusion

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