Drifting periodic structures in a degenerate-planar bent-rod nematic liquid crystal beyond the dielectric inversion frequency

Kumar P, Hiremath US, Yelamaggad CV, Rossberg AG, & Krishnamurthy KS (2008). Drifting periodic structures in a degenerate-planar bent-rod nematic liquid crystal beyond the dielectric inversion frequency. The Journal of Physical Chemistry B 112 (31): 9270-9274. DOI:10.1021/jp804264m.

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Abstract

We report on the electric-field-generated effects in the nematic aligned homeotropically in the initial ground state and examined beyond the dielectric inversion point. The bend-Freedericksz (BF) state occurring at the primary bifurcation and containing a network of umbilics is metastable; we focus here on the degenerate planar (DP) configuration that establishes itself at the expense of the BF state in the course of an anchoring transition. In the DP regime, normal rolls, broad domains, and chevrons (both defect-mediated and defect-free types) form at various linear defect-sites, in different regions of the frequency-voltage plane. A significant novel aspect common to all these patterned states is the sustained propagative instability, which does not seem explicable on the basis of known driving mechanisms.

Item Type: Article
Research Programs: Evolution and Ecology (EEP)
Bibliographic Reference: The Journal of Physical Chemistry B; 112(31):9270-9274 (7 August 2008) (Published online 10 July 2008)
Depositing User: IIASA Import
Date Deposited: 15 Jan 2016 08:40
Last Modified: 26 Feb 2016 12:40
URI: http://pure.iiasa.ac.at/8528

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