Discretized model for diffusion of a chain in one dimension

S.E. GUIDONI, H.O. MÁRTIN, Y C.M. ALDAO

PHYSICAL REVIEW E - STATISTICAL PHYSICS, PLASMAS, FLUIDS AND RELATED INTERDISCIPLINARY TOPICS

Año: 2003 vol. 67 p. 31804 - 31804

1063-651X

With the help of a Monte Carlo simulation, the one-dimensional diffusion motion of a chain of N beads is studied to determine its diffusion coefficient and viscosity.  We show that the scaling exponent for the viscosity can be smaller or greater than 3 but it must scale as N3 in the asymptotic regime (N=infinite).  The found anomalous behavior is due to the whole chain dynamics during diffusion.  We analyze in detail the behavior for a chain with three beads to interpret the observed results.