Nonstandard electroconvection and flexoelectricity in nematic liquid crystals

Alexei Krekhov, Werner Pesch, Nándor Iber, Tibor Tóth-Katona, Ágnes Buka

Research output: Contribution to journalArticle

46 Citations (Scopus)


For many years it has been commonly accepted that electroconvection (EC) as primary instability in nematic liquid crystals for the "classical" planar geometry requires a positive anisotropy of the electric conductivity, σa, and a slightly negative dielectric anisotropy, a. This firm belief was supported by many experimental and theoretical studies. Recent experiments, which have surprisingly revealed EC patterns at negative conduction anisotropy as well, have motivated the theoretical studies in this paper. It will be demonstrated that extending the common hydrodynamic description of nematics by the usually neglected flexoelectric effect allows for a simple explanation of EC in the "nonstandard" case σa <0.

Original languageEnglish
Article number021705
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Issue number2
Publication statusPublished - Feb 13 2008

ASJC Scopus subject areas

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

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