Transition from longitudinal to transversal patterns in an anisotropic system

Martin May, Wolfgang Schöpf, Ingo Rehberg, Alexei Krekhov, Agnes Buka

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21 Citations (Scopus)

Abstract

Periodic stripe patterns which form when an electric field is applied to a thin nematic liquid crystal layer with a very low conductivity are discussed. In this case the dielectric electroconvection mode persists down to very low frequencies of the driving voltage. A Lifschitz point, i.e., a transition from normal to oblique rolls is detected in the dielectric regime. A crossover from electroconvection to flexoelectric domains occurs for extremely low frequencies of about 0.1 Hz. The crossover scenario yields pattern morphologies characteristic for both mechanisms, i.e., electroconvection and flexoelectric domains which appear consecutively within one period of the driving voltage. A theoretical description of the onset characteristics of dielectric convection, which is based on an extended model including flexoelectricity, is also presented.

Original languageEnglish
Article number046215
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume78
Issue number4
DOIs
Publication statusPublished - Oct 24 2008

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ASJC Scopus subject areas

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

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