Nucleation and step-edge barriers always destabilize step-flow growth of a vicinal surface

Details Nucleation and step-edge barriers always destabilize step-flow growth of a vicinal surface Nucleation and step-edge barriers always destabilize step-flow growth of a vicinal surface

2005-02-08

arxiv.org/abs/cond-mat/0502199v3

Surface Sci. Lett. 588, L227-L232 (2005)

Physics

Condensed Matter

Materials Science

10 pages, 4 figures. One figure added and discussion of the critical nucleus revised. Accepted for publication on Surface Scie

Scientific paper

10.1016/j.susc.2005.05.025

We consider the effect of nucleation on a one-dimensional stepped surface, finding that step-flow growth is metastable for any strength of the additional step-edge barrier. The surface is made unstable by the formation of a critical nucleus, whose lateral size is related to the destabilization process on a high-symmetry surface. Arguments based on a critical nucleus of height two, which suggest the existence of a fully stable regime for small barrier, fail to describe this phenomenon.

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