Competing mechanisms for step meandering in unstable growth
| Autor: | Joachim Krug, Miroslav Kotrla, Jouni Kallunki |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2001 |
| Předmět: |
Physics
Condensed Matter - Materials Science Statistical Mechanics (cond-mat.stat-mech) Condensed matter physics Rounding Nucleation Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences Instability Nonlinear system Wavelength Amplitude Meander Vicinal Condensed Matter - Statistical Mechanics |
| Popis: | The meander instability of a vicinal surface growing under step flow conditions is studied within a solid-on-solid model. In the absence of edge diffusion the selected meander wavelength agrees quantitatively with the continuum linear stability analysis of Bales and Zangwill [Phys. Rev. B {\bf 41}, 4400 (1990)]. In the presence of edge diffusion a local instability mechanism related to kink rounding barriers dominates, and the meander wavelength is set by one-dimensional nucleation. The long-time behavior of the meander amplitude differs in the two cases, and disagrees with the predictions of a nonlinear step evolution equation [O. Pierre-Louis et al., Phys. Rev. Lett. {\bf 80}, 4221 (1998)]. The variation of the meander wavelength with the deposition flux and with the activation barriers for step adatom detachment and step crossing (the Ehrlich-Schwoebel barrier) is studied in detail. The interpretation of recent experiments on surfaces vicinal to Cu(100) [T. Maroutian et al., Phys. Rev. B {\bf 64}, 165401 (2001)] in the light of our results yields an estimate for the kink barrier at the close packed steps. 8 pages, 7 .eps figures. Final version. Some errors in chapter V corrected |
| Databáze: | OpenAIRE |
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