Zigzag instability of a chi disclination line in a cholesteric liquid crystal.

The European Physical Journal. E, Soft Matter
A Dequidt, P Oswald

Abstract

We studied the formation of chi disclination lines in planar cholesteric samples placed in a temperature gradient near the cholesteric to smectic A phase transition. We observed that the first simple line which forms close to the smectic-cholesteric front zigzags when it is perpendicular to the direction of planar anchoring and is straight for other orientations. This instability is similar to Herring instability for crystalline surfaces. We show numerically that it originates from a strong increase of the elastic anisotropy close to the transition. In addition, we propose a new method to measure the pitch divergence at the smectic to cholesteric phase transition.

References

Apr 1, 1994·Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics·C W Garland, G Nounesis
Mar 1, 1993·Physical Review. B, Condensed Matter·D G VlachosR Aris
Nov 25, 1985·Physical Review Letters·Y Galerne, L Liébert
Mar 19, 1990·Physical Review Letters·F Melo, P Oswald

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Citations

Oct 7, 2010·The European Physical Journal. E, Soft Matter·P Oswald
Sep 20, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·G PicardF Ghozayel
Sep 13, 2014·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·I Andrade-SilvaV Odent
Apr 5, 2013·Physical Review Letters·Atsushi TakeiFrancisco Melo
Sep 28, 2010·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·H G YoonH F Gleeson

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