Memory-Controlled Diffusion

Details Memory-Controlled Diffusion Memory-Controlled Diffusion

2004-03-22

arxiv.org/abs/cond-mat/0403554v1

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

10.1103/PhysRevE.70.056133

Memory effects require for their incorporation into random-walk models an extension of the conventional equations. The linear Fokker-Planck equation for the probability density $p(\vec r, t)$ is generalized to include non-linear and non-local spatial-temporal memory effects. The realization of the memory kernels are restricted due the conservation of the basic quantity $p$. A general criteria is given for the existence of stationary solutions. In case the memory kernel depends on $p$ polynomially the transport is prevented. Owing to the delay effects a finite amount of particles remains localized and the further transport is terminated. For diffusion with non-linear memory effects we find an exact solution in the long-time limit. Although the mean square displacement shows diffusive behavior, higher order cumulants exhibits differences to diffusion and they depend on the memory strength.

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