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Communications: Drift and diffusion in a tube of periodically varying diameter. Driving force induced intermittency
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We show that the effect of driving force on the effective mobility and diffusion coefficient of a particle in a tube formed by identical compartments may be qualitatively different depending on the compartment shape. In tubes formed by cylindrical (spherical) compartments the mobility monotonically decreases (increases) with and the diffusion coefficient diverges (remains finite) as tends to infinity. In tubes formed by cylindrical compartments, at large there is intermittency in the particle transitions between openings connecting neighboring compartments.
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