Numerical study of domain coarsening in anisotropic stripe patterns

Details Numerical study of domain coarsening in anisotropic stripe patterns Numerical study of domain coarsening in anisotropic stripe patterns

2004-03-09

arxiv.org/abs/cond-mat/0403227v1

Physics

Condensed Matter

Soft Condensed Matter

8 pages, 11 figures. Phys. Rev E, to appear

Scientific paper

10.1103/PhysRevE.69.066111

We study the coarsening of two-dimensional smectic polycrystals characterized by grains of oblique stripes with only two possible orientations. For this purpose, an anisotropic Swift-Hohenberg equation is solved. For quenches close enough to the onset of stripe formation, the average domain size increases with time as $t^{1/2}$. Further from onset, anisotropic pinning forces similar to Peierls stresses in solid crystals slow down defects, and growth becomes anisotropic. In a wide range of quench depths, dislocation arrays remain mobile and dislocation density roughly decays as $t^{-1/3}$, while chevron boundaries are totally pinned. We discuss some agreements and disagreements found with recent experimental results on the coarsening of anisotropic electroconvection patterns.

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