Effect of step stiffness and diffusion anisotropy on the meandering of a growing vicinal surface

Details Effect of step stiffness and diffusion anisotropy on the meandering of a growing vicinal surface Effect of step stiffness and diffusion anisotropy on the meandering of a growing vicinal surface

2006-02-15

arxiv.org/abs/cond-mat/0602353v1

Physics

Condensed Matter

Statistical Mechanics

4 pages, 3 figures, submitted to Phys. Rev. Lett. (February 2006)

Scientific paper

10.1103/PhysRevLett.96.166104

We study the step meandering instability on a surface characterized by the alternation of terraces with different properties, as in the case of Si(001). The interplay between diffusion anisotropy and step stiffness induces a finite wavelength instability corresponding to a meandering mode. The instability sets in beyond a threshold value which depends on the relative magnitudes of the destabilizing flux and the stabilizing stiffness difference. The meander dynamics is governed by the conserved Kuramoto-Sivashinsky equation, which display spatiotemporal coarsening.

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