Abstract
Diffusion on percolating clusters has attracted much attention since de Gentles´ proposal1 of the “ant in the labyrinth”. It has recently been realized2 that diffusion becomes anomalous for times shorter than a typical crossover time, τ, of order ξ2+θ where e—ξ~|p c-p|-v is the percolation correlation length and θ describes the scaling of the diffusion coefficent on the infinite percolating cluster above the threshold p c, D~ξ-θ. On the infinite cluster, the mean square distance <r 2> after t time steps behaves as t 2/(2+ θ ) for 1«t«τ, and as Dt for t»τ. τ is thus the time it takes to diffuse a typical distance ξ. Similar anomalous diffusion occurs on finite clusters, for distances short compared to the cluster size.
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References
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© 1987 Plenum Press, New York
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Meir, Y., Harris, A.B., Aharony, A. (1987). Diffusion on Percolation Clusters. In: Pynn, R., Riste, T. (eds) Time-Dependent Effects in Disordered Materials. NATO ASI Series, vol 167. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-7476-3_19
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DOI: https://doi.org/10.1007/978-1-4684-7476-3_19
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