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Crossover effects in the Wolf-Villain model of epitaxial growth in 1+1 and 2+1 dimensions

Pavel Šmilauer·Miroslav Kotrla
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Abstract

A simple model of epitaxial growth proposed by Wolf and Villain is investigated using extensive computer simulations. We find an unexpectedly complex crossover behavior of the original model in both 1+1 and 2+1 dimensions. A crossover from the effective growth exponent $β_{\rm eff}\!\approx\!0.37$ to $β_{\rm eff}\!\approx\!0.33$ is observed in 1+1 dimensions, whereas additional crossovers, which we believe are to the scaling behavior of an Edwards--Wilkinson type, are observed in both 1+1 and 2+1 dimensions. Anomalous scaling due to power--law growth of the average step height is found in 1+1 D, and also at short time and length scales in 2+1~D. The roughness exponents $ζ_{\rm eff}^{\rm c}$ obtained from the height--height correlation functions in 1+1~D ($\approx\!3/4$) and 2+1~D ($\approx\!2/3$) cannot be simultaneously explained by any of the continuum equations proposed so far to describe epitaxial growth.

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Pavel Šmilauer, Miroslav Kotrla. 1994-01-31. Crossover effects in the Wolf-Villain model of epitaxial growth in 1+1 and 2+1 dimensions. https://doi.org/10.1103/physrevb.49.5769

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