Noise-assisted mound coarsening in epitaxial growth |
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Authors: | L-H Tang P Smilauer DD Vvedensky |
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Institution: | (1) The Blackett Laboratory, Imperial College, London SW7 2BZ, UK, GB;(2) Department of Physics and Center for Nonlinear Studies, Hong Kong Baptist University, Kowloon Tong, Hong Kong, HK;(3) Institute of Physics, Cukrovarnická 10, 162 00 Praha 6, Czech Republic, CZ |
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Abstract: | Two types of mechanisms are proposed for mound coarsening during unstable epitaxial growth: stochastic, due to deposition
noise, and deterministic, due to mass currents driven by surface energy differences. Both yield the relation H=(RWL)2 between the typical mound height W, mound size L, and the film thickness H. An analysis of simulations and experimental data shows that the parameter R saturates to a value which discriminates sharply between stochastic () and deterministic () coarsening. We derive a scaling relation between the coarsening exponent 1/z and the mound-height exponent which, for a saturated mound slope, yields .
Received: 11 November 1997 / Revised in final form: 28 November 1997 /
Accepted: 28 November 1997 |
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Keywords: | PACS 68 55 -a Thin film structure morphology - 05 70 Ln Nonequilibrium thermodynamics irreversible processes - 81 10 Aj Theory and models of crystal growth physics of crystal growth crytal morphology and orientation |
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