Bulk Mediated Surface Diffusion: The Infinite System Case

Details Bulk Mediated Surface Diffusion: The Infinite System Case Bulk Mediated Surface Diffusion: The Infinite System Case

2003-09-02

arxiv.org/abs/cond-mat/0309054v1

Physics

Condensed Matter

15 pages, 7 figures

Scientific paper

10.1140/epjb/e2003-00341-x

An analytical soluble model based on a Continuous Time Random Walk (CTRW) scheme for the adsorption-desorption processes at interfaces, called bulk-mediated surface diffusion, is presented. The time evolution of the effective probability distribution width on the surface is calculated and analyzed within an anomalous diffusion framework. The asymptotic behavior for large times shows a sub-diffusive regime for the effective surface diffusion but, depending on the observed range of time, other regimes may be obtained. Montecarlo simulations show excellent agreement with analytical results. As an important byproduct of the indicated approach, we present the evaluation of the time for the first visit to the surface.

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