Dynamic Scaling of Width Distribution in Edwards--Wilkinson Type Models of Interface Dynamics

Details Dynamic Scaling of Width Distribution in Edwards--Wilkinson Type Models of Interface Dynamics Dynamic Scaling of Width Distribution in Edwards--Wilkinson Type Models of Interface Dynamics

1995-10-31

arxiv.org/abs/cond-mat/9510170v1

Phys. Rev. E 54, 2256 (1996)

Physics

Condensed Matter

5 pages, latex, 3 ps figures in a separate files, submitted to Phys.Rev.E

Scientific paper

10.1103/PhysRevE.54.2256

Edwards--Wilkinson type models are studied in 1+1 dimensions and the time-dependent distribution, P_L(w^2,t), of the square of the width of an interface, w^2, is calculated for systems of size L. We find that, using a flat interface as an initial condition, P_L(w^2,t) can be calculated exactly and it obeys scaling in the form _\infty P_L(w^2,t) = Phi(w^2 / _\infty, t/L^2) where _\infty is the stationary value of w^2. For more complicated initial states, scaling is observed only in the large- time limit and the scaling function depends on the initial amplitude of the longest wavelength mode. The short-time limit is also interesting since P_L(w^2,t) is found to closely approximate the log-normal distribution. These results are confirmed by Monte Carlo simulations on a `roof-top' model of surface evolution.

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