Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2006-05-22
Physics
Condensed Matter
Statistical Mechanics
17 pages, including 5 figures; submited to Phys. Rev. E in Dec 2005, revised Apr 2006
Scientific paper
10.1103/PhysRevE.74.011604
We study a restricted solid-on-solid (RSOS) model involving deposition and evaporation with probabilities p and 1-p, respectively, in one-dimensional substrates. It presents a crossover from Edwards-Wilkinson (EW) to Kardar-Parisi-Zhang (KPZ) scaling for p~0.5. The associated KPZ equation is analytically derived, exhibiting a coefficient lambda of the nonlinear term proportional to q=p-1/2, which is confirmed numerically by calculation of tilt-dependent growth velocities for several values of p. This linear \lambda-q relation contrasts to the apparently universal parabolic law obtained in competitive models mixing EW and KPZ components. The regions where the interface roughness shows pure EW and KPZ scaling are identified for 0.55<=p<=0.8, which provides numerical estimates of the crossover times t_c. They scale as t_c ~ lambda^(-phi) with phi=4.1+-0.1, which is in excellent agreement with the theoretically predicted universal value phi=4 and improves previous numerical estimates, which suggested phi~3.
Aarao Reis Fabio D. A.
Dechoum Kaled
Oliveira T. J.
Redinz José Arnaldo
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