Pattern formation of chevrons in the conduction regime in homeotropically aligned liquid crystals

J.H. Huh, Y. Hidaka, Axel Rossberg, S. Kai

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

We report on chevrons (herringbonelike patterns) observed in homeotropically aligned liquid crystals with high electric conductivity. We focus our attention on two types of chevrons observed in the conduction regime. The threshold voltage and the characteristic double periodicity of chevrons (i.e., the short wavelength lambda(1) of the striated rolls and the long wavelength lambda(2) Of the chevron bands) have been measured as functions of the applied electric frequency f. With the aid of a crossed polarizer set, we have, in addition, determined the director field which shows a periodic in-plane rotation for our chevrons (with a wavelength lambda(2)) We arrived at the types of chevrons after qualitatively different bifurcation sequences with increasing voltage. The frequency dependence of lambda(2) also shows a qualitatively different behavior with respect to the two types of chevrons. The experimental results are discussed in terms of recent theoretical investigations.
Original languageEnglish
Pages (from-to)2769-2776
Number of pages8
JournalPhysical Review E Online
Volume61
Issue number3
Publication statusPublished - Mar 2000

ASJC Scopus subject areas

  • Mathematical Physics
  • Physics and Astronomy(all)
  • Condensed Matter Physics
  • Statistical and Nonlinear Physics

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