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

P. Kumar, U.S. Hiremath, C.V. Yelamaggad, Axel Rossberg, K.S. Krishnamurthy

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

We report on the electric-field-generated effects in the nematic phase of a twin mesogen formed of bent-core and calamitic units, 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.
Original languageEnglish
Pages (from-to)9270-9274
Number of pages5
JournalJournal of Physical Chemistry B
Volume112
Issue number31
DOIs
Publication statusPublished - 07 Aug 2008

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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