Competing modes of instability in an electrically driven nematic liquid crystal with a small positive dielectric anisotropy

Pramoda Kumar, K. S. Krishnamurthy

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Competing modes of electric-field-driven bifurcation have been examined in a planarly aligned nematic liquid crystal with a small positive dielectric anisotropy and large electrical conductivity. The line of bifurcation into the electroconvective state is linear in frequency not only up to the codimension-2 (C2) point but well beyond. This contrasts with the recent theoretical prediction of the absence of further bifurcations within the Freedericksz state, above the C2 frequency. Further, in the frequency regime beyond C2, within the space-filling electroconvective state, a strongly localized dynamical state (SLDS) appears at a voltage threshold which again is linear in frequency. Occurrence of the SLDS through a secondary forward bifurcation is significant in view of the reported observations on the so-called worms, an instability belonging to the SLDS, as the first form of convection seen at the primary subcritical bifurcation.

Original languageEnglish
Article number031705
JournalPhysical Review E
Volume74
Issue number3
DOIs
StatePublished - 25 Sep 2006
Externally publishedYes

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

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