Abstract
The asymptotic scaling behavior of sputter-roughened surfaces is of great current interest. In particular, the disparately wide-ranging values of the growth exponent found experimentally, and whether sputter-roughening belongs to the Kardar-Parisi-Zhang universality class in 2+1 dimensions, are two interesting issues. We address these issues using simulations of an atomistic model. The asymptotic scaling appears to be Edwards-Wilkinson. Crossover behavior in the model leads to effective growth exponents that vary widely depending upon the regime of observation.
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