Fluctuations of steps on crystal surfaces
Selke, W., Szalma, F., and Hager, J.S.
Technische Hochschule Aachen, Germany
Szeged University, Hungary
University of Maryland, USA
Fluctuations of isolated and pairs of ascending steps of monoatomic
height are studied in the framework of SOS models, using mainly
Monte Carlo techniques. Below the roughening transition of the surface, the
profiles of long steps show the same scaling features for terrace and
surface diffusion. For a pair of short steps, their separation
distance is found to grow as t^1/3 at late stages. Above roughening,
simulational data on surface diffusion agree well with the classical
continuum theory of Mullins.