Diffusion in infinite and semi-infinite lattices with long-range coupling

M.I. Molina
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL 45 (2012)

ABSTRACT

We prove that for a one-dimensional infinite lattice, with long-range coupling among sites, the diffusion of an initial delta-like pulse in the bulk, is ballistic at all times. We obtain a closed- form expression for the mean square displacement (MSD) as a function of time, and use it in some cases of interest, including finite range, exponentially decreasing coupling and power-law decreasing coupling. For the case of an initial excitation at the edge of the lattice, we find an approximate expression for the MSD that predicts ballistic behavior at long times, in agreement with numerical results.

DOI: http://dx.doi.org/



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