Zig-zag instability of an Ising wall in liquid crystals

Details Zig-zag instability of an Ising wall in liquid crystals Zig-zag instability of an Ising wall in liquid crystals

2001-04-16

arxiv.org/abs/nlin/0104033v1

Nonlinear Sciences

Pattern Formation and Solitons

4 pagess, 4 figures, letter

Scientific paper

10.1209/epl/i2002-00404-8

We present a theoretical explanation for the interfacial zigzag instability that appears in anisotropic systems. Such an instability has been experimentally highlighted for an Ising wall formed in a nematic liquid crystal cell under homeotropic anchoring conditions. From an envelope equation, relevant close to the Freedericksz transition, we have derived an asymptotic equation describing the interface dynamics in the vicinity of its bifurcation. The asymptotic limit used accounts for a strong difference between two of the elastic constants. The model is characterized by a conservative order parameter which satisfies a Cahn-Hilliard equation. It provides a good qualitative understanding of the experiments.

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