| Numéro |
J. Phys. I France
Volume 5, Numéro 10, October 1995
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|
|---|---|---|
| Page(s) | 1317 - 1350 | |
| DOI | https://doi.org/10.1051/jp1:1995200 | |
J. Phys. I France 5 (1995) 1317-1350
Growth Instabilities Induced by Elasticity in a Vicinal Surface
Christophe Duport1, Paolo Politi2 and Jacques Villain11 CEA, Département de Recherche Fondamentale sur la Matière Condenssée, SPSMS/MDN, 38054 Grenoble Cedex 9, France
2 CEA, Département de Recherche Fondamentale sur la Matière Condensée, SPMM/MP, 38054 Grenoble Cedex 9, France
(Received 31 May 1995, accepted 26 June 1995)
Abstract
We study the effect of elasticity on the step-bunching instability in heteroepitaxial growth on a
vicinal substrate. Three main effects are taken into account: the Schwoebel barrier and the
step-step and the step-adatom elastic interactions. The first one is always stabilizing, the
second one generally destabilizing and the last one, stabilizing or not according to the sign of
the misfit with the substrate. At very low values of the flux
F, only the step-step interaction
is effective: the stabilization is provided by the broken bond mechanism and the destabilization
by the misfit mechanism. At increasing
F, the stabilization is governed by the Schwoebel effect
and only the misfit mechanism needs to be taken into account. A stability phase diagram, taking
into account also a possible instability for island nucleation, is drawn in the plane
(flux,temperature): a stable region appears, at intermediate values of
F.
© Les Editions de Physique 1995