Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2000-05-29
Physics
Condensed Matter
Statistical Mechanics
10 pages, 3 figures. MPEG movies of simulated growing surfaces available online at http://theorie.physik.uni-wuerzburg.de/~a
Scientific paper
10.1016/S0039-6028(00)00725-1
We report the results of computer simulations of epitaxial growth in the presence of a large Schwoebel barrier on different crystal surfaces: simple cubic(001), bcc(001), simple hexagonal(001) and hcp(001). We find, that mounds coarse by a step edge diffusion driven process, if adatoms can diffuse relatively far along step edges without being hindered by kink-edge diffusion barriers. This yields the scaling exponents alpha = 1, beta = 1/3. These exponents are independent of the symmetry of the crystal surface. The crystal lattice, however, has strong effects on the morphology of the mounds, which are by no means restricted to trivial symmetry effects: while we observe pyramidal shapes on the simple lattices, on bcc and hcp there are two fundamentally different classes of mounds, which are encompanied by characteristic diffusion currents: a metastable one with rounded corners, and an actively coarsening configuration, which breaks the symmetry given by the crystal surface.
Ahr Martin
Biehl Michael
Kinne M.
Kinzel Wolfgang
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