Transformation from walls to disclination lines : Statics and dynamics of the pincement transition

URN to cite this document: urn:nbn:de:bvb:703-epub-3988-9

Title data

de Lózar, Alberto ; Schöpf, Wolfgang ; Rehberg, Ingo ; Svensek, Daniel ; Kramer, Lorenz:
Transformation from walls to disclination lines : Statics and dynamics of the pincement transition.
In: Physical Review E. Vol. 72 (November 2005) Issue 5 . - Art. Nr. 051713.
ISSN 1550-2376
DOI der Verlagsversion: https://doi.org/10.1103/PhysRevE.72.051713

Format: PDF Name: PhysRevE.72.051713.pdf Version: Published Version Available under License German copyright law. This contribution is freely accessible with the consent of the copyright holder on the basis of an (DFG-funded) alliance or national license. The document may be used free of charge for personal use. In addition, the reproduction, editing, distribution and any kind of exploitation require the written consent of the respective rights holder.

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Abstract

We present an experimental and theoretical study of the pincement phenomenon—transformation of a wall associated with the Fréedericksz transition into a pair of disclination lines. We measure the velocity of the boundary (front) between the two states as a function of the voltage. Experimental results are recovered by numerical simulations based on the nematic tensor order parameter, which also reveal the detailed three-dimensional structure of the front. By introducing reduced models we obtain approximate expressions for the two-state coexistence voltage and the front velocity. We find a bifurcation scenario incorporating a pair of saddle nodes at which the wall and disclination solutions appear or disappear.

Further data

Item Type:	Article in a journal
Keywords:	Experimental determinations of smectic, nematic, cholesteric, and other structures; Orientational order of liquid crystals, electric and magnetic field effects on order; Defects in liquid crystals; Continuum models and theories of liquid crystal structure
DDC Subjects:	500 Science > 530 Physics
Institutions of the University:	Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Former Professors > 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 Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Former Professors
Language:	English
Originates at UBT:	Yes
URN:	urn:nbn:de:bvb:703-epub-3988-9
Date Deposited:	28 Jan 2019 13:59
Last Modified:	06 Jul 2020 10:21
URI:	https://epub.uni-bayreuth.de/id/eprint/3988

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