Anomalous Infiltration

Abstract

Infiltration of anomalously diffusing particles from one material to another through a biased interface is studied using continuous time random walk and Levy walk approaches. Subdiffusion in both systems may lead to a net drift from one material to another (e.g. <x(t)> > 0) even if particles eventually flow in the opposite direction (e.g. number of particles in x>0 approaches zero). A weaker paradox is found for a symmetric interface: a flow of particles is observed while the net drift is zero. For a subdiffusive sample coupled to a superdiffusive system we calculate the average occupation fractions and the scaling of the particles distribution. We find a net drift in this system, which is always directed to the superdiffusive material, while the particles flow to the material with smaller sub or superdiffusion exponent. We report the exponents of the first passage times distribution of Levy walks, which are needed for the calculation of anomalous infiltration

21 pages, 9 figures

References in corpus (6)

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• Probing microscopic origins of confined subdiffusion by first-passage observables
• Paradoxes of Subdiffusive Infiltration in Disordered Systems
• A Random Walk to a Non-Ergodic Equilibrium Concept
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• Subdiffusion--absorption process in a system consisting of two different media
• Multiphase Partitions of Lattice Random Walks