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Title: From subdiffusion to superdiffusion of particles on solid surfaces
Author: Lacasta Palacio, Ana María
Sancho, José M.
Romero, A. H.
Sokolov, Igor M., 1958-
Lindenberg, Katja
Keywords: Física estadística
Sistemes dinàmics diferenciables
Transformacions de fase (Física estadística)
Pel·lícules fines
Statistical physics
Differentiable dynamical systems
Phase transformations (Statistical physics)
Thin films
Issue Date: 2004
Publisher: The American Physical Society
Abstract: We present a numerical and partially analytical study of classical particles obeying a Langevin equation that describes diffusion on a surface modeled by a two-dimensional potential. The potential may be either periodic or random. Depending on the potential and the damping, we observe superdiffusion, large-step diffusion, diffusion, and subdiffusion. Superdiffusive behavior is associated with low damping and is in most cases transient, albeit often long. Subdiffusive behavior is associated with highly damped particles in random potentials. In some cases subdiffusive behavior persists over our entire simulation and may be characterized as metastable. In any case, we stress that this rich variety of behaviors emerges naturally from an ordinary Langevin equation for a system described by ordinary canonical Maxwell-Boltzmann statistics.
Note: Reproducció del document publicat a:
It is part of: Physical Review E, 2004, vol. 70, núm. 5, p. 051104(1)-051104(10)
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ISSN: 1539-3755
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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