Two-Dimensional Diffusion in the Presence of Topological Disorder
arXiv:cond-mat/0308612 · doi:10.1103/PhysRevE.68.021107
Abstract
How topological defects affect the dynamics of particles hopping between lattice sites of a distorted, two-dimensional crystal is addressed. Perturbation theory and numerical simulations show that weak, short-ranged topological disorder leads to a finite reduction of the diffusion coefficient. Renormalization group theory and numerical simulations suggest that longer-ranged disorder, such as that from randomly placed dislocations or random disclinations with no net disclinicity, leads to subdiffusion at long times.
10 pages, 6 figures