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

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.
Complete list of metadatas

Cited literature [18 references]  Display  Hide  Download

https://hal-ens-lyon.archives-ouvertes.fr/ensl-00182727
Contributor : Patrick Oswald <>
Submitted on : Friday, October 26, 2007 - 7:53:29 PM
Last modification on : Monday, August 19, 2019 - 2:22:05 PM
Long-term archiving on : Monday, April 12, 2010 - 12:50:52 AM

File

Dequidt-oswald06.pdf
Publisher files allowed on an open archive

Identifiers

  • HAL Id : ensl-00182727, version 1

Collections

Citation

Alain Dequidt, Patrick Oswald. Zigzag instability of a chi disclination line in a cholesteric liquid crystal. European Physical Journal E: Soft matter and biological physics, EDP Sciences: EPJ, 2006, 19 (4), pp.489-500. ⟨ensl-00182727⟩

Share

Metrics

Record views

98

Files downloads

111