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The corkscrew instability of a Fréedericksz domain wall in a nematic liquid crystal

Title data

Muñoz, Alberto de Lózar ; Bock, Thomas ; Müller, Matthias ; Schöpf, Wolfgang ; Rehberg, Ingo:
The corkscrew instability of a Fréedericksz domain wall in a nematic liquid crystal.
In: New Journal of Physics. Vol. 5 (2003) . - no. 63.1-63.12.
ISSN 1367-2630
DOI: https://doi.org/10.1088/1367-2630/5/1/363

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Abstract in another language

A liquid crystal with slightly positive dielectric anisotropy is investigated in the planar configuration. This system allows for competition between electroconvection and the homogeneous Fréedericksz transition, leading to a rather complicated bifurcation scenario. We report measurements of a novel instability leading to the "corkscrew" pattern. This state is closely connected to the Fréedericksz state as it manifests itself as a regular modulation along a Fréedericksz domain wall, although its frequency dependence indicates that electroconvection must play a crucial role. It can be understood in terms of a pitchfork bifurcation from a straight domain wall. Quantitative characterization is performed in terms of amplitude, wavelength and relaxation time. Its wavelength is of the order of the probe thickness, while its ondulation amplitude is an order of magnitude smaller. The relaxation time is comparable to the one obtained for electroconvection.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Nonlinear dynamics; Pattern formation; Spatially extended systems; Nematic liquid crystal; Fréedericksz transition; Corkscrew instability
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics V > Chair Experimental Physics V - Univ.-Prof. Dr. Ingo Rehberg
Profile Fields > Advanced Fields > Nonlinear Dynamics
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics V
Profile Fields
Profile Fields > Advanced Fields
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 04 Oct 2018 11:23
Last Modified: 20 Feb 2019 10:42
URI: https://eref.uni-bayreuth.de/id/eprint/42979