Convection-roll instability in spite of a large stabilizing torque

Pramoda Kumar, Jana Heuer, Tibor Tóth-Katona, Nándor Iber, Agnes Buka

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


Two electroconvection (EC) pattern morphologies-a cellular and a subsequent roll pattern-have been detected in the same frequency range in a nematic with positive permittivity and conductivity anisotropies. The frequency dependences of the onset voltages and critical wave numbers have been determined both for homeotropic and planar alignments. It has been proven that both pattern morphologies have a dielectric time symmetry. We also discuss possible sources for the pattern formation in the frame of both the isotropic (Felici-Benard) mechanism, as well as the standard model of EC.

Original languageEnglish
Article number020702
JournalPhysical Review E
Issue number2
StatePublished - 25 Feb 2010
Externally publishedYes

ASJC Scopus subject areas

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


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