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Diffusion on a solid surface: anomalous is normal
Sancho, José M.; Lacasta Palacio, Ana María; Lindenberg, Katja; Sokolov, Igor M., 1958-; Romero, A. H.
Universitat de Barcelona
We present a numerical study of classical particles diffusing on a solid surface. The particles motion is modeled by an underdamped Langevin equation with ordinary thermal noise. The particle-surface interaction is described by a periodic or a random two-dimensional potential. The model leads to a rich variety of different transport regimes, some of which correspond to anomalous diffusion such as has recently been observed in experiments and Monte Carlo simulations. We show that this anomalous behavior is controlled by the friction coefficient and stress that it emerges naturally in a system described by ordinary canonical Maxwell-Boltzmann statistics.
2010-06-12
Física estadística
Termodinàmica
Statistical physics
Thermodynamics
(c) American Physical Society, 2004
Article
American Physical Society
         

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