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arXiv · 1011.2284

Anomalous diffusion in a space- and time-dependent energy landscape

Loic Turban
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Abstract

We study the influence on diffusion in one dimension of a potential energy perturbation varying as a power in space and time. We concentrate on the case of a parabolic perturbation in space decaying as $t^{-ω}$ which shows a rich variety of scaling behaviours. When $ω=1$, the perturbation is truly marginal and leads to anomalous (super)diffusion with a dynamical exponent varying continuously with the perturbation amplitude below some negative threshold value. For slower decay, $ω<1$, the perturbation becomes relevant and the system is either subdiffusive for an attractive potential or displays a stretched-exponential behaviour for a repulsive one. Exact results are obtained for the mean value and the variance of the position as well as for the surviving probability.

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Loic Turban. 2010-12-07. Anomalous diffusion in a space- and time-dependent energy landscape. https://doi.org/10.1088/1742-5468%2F2010%2F12%2Fp12013

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