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Dynamics of a Liquid Crystal close to the Fréedericksz transition

We report experimental and numerical evidences that the dynamics of the director of a liquid crystal driven by an electric field close to the critical point of the Fréedericksz Transition(FT) is not described by a Landau-Ginzburg (LG) equation as it is usually done in literature. The reasons are related to the very crude approximations done to obtain this equation, to the finite value of the anchoring energy and to small asymmetries on boundary conditions. We also discuss the difference between the use of LG equation for the statics and the dynamics. These results are useful in all cases where FT is used as an example for other orientational transitions.

preprint2013arXivOpen access
Aude CaussarieuArtyom PetrosyanSergio Ciliberto
cond-mat.stat-mechcond-mat.soft
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Aude CaussarieuArtyom PetrosyanSergio Ciliberto

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