Patterns driven by combined ac and dc electric fields in nematic liquid crystals

Alexei Krekhov, Werner Decker, Werner Pesch, Nándor Éber, Péter Salamon, Balázs Fekete, A. Buka

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The effect of superimposed ac and dc electric fields on the formation of electroconvection and flexoelectric patterns in nematic liquid crystals was studied. For selected ac frequencies, an extended standard model of the electrohydrodynamic instabilities was used to characterize the onset of pattern formation in the two-dimensional parameter space of the magnitudes of the ac and dc electric field components. Numerical as well as approximate analytical calculations demonstrate that depending on the type of patterns and on the ac frequency, the combined action of ac and dc fields may either enhance or suppress the formation of patterns. The theoretical predictions are qualitatively confirmed by experiments in most cases. Some discrepancies, however, seem to indicate the need to extend the theoretical description.

Original languageEnglish
Article number052507
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume89
Issue number5
DOIs
Publication statusPublished - May 19 2014

Fingerprint

Nematic Liquid Crystal
Electric Field
liquid crystals
electric fields
Electrohydrodynamics
Pattern Formation
electrohydrodynamics
Discrepancy
Parameter Space
Standard Model
Prediction
Demonstrate
Experiment
predictions

ASJC Scopus subject areas

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

Cite this

Patterns driven by combined ac and dc electric fields in nematic liquid crystals. / Krekhov, Alexei; Decker, Werner; Pesch, Werner; Éber, Nándor; Salamon, Péter; Fekete, Balázs; Buka, A.

In: Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, Vol. 89, No. 5, 052507, 19.05.2014.

Research output: Contribution to journalArticle

Krekhov, Alexei ; Decker, Werner ; Pesch, Werner ; Éber, Nándor ; Salamon, Péter ; Fekete, Balázs ; Buka, A. / Patterns driven by combined ac and dc electric fields in nematic liquid crystals. In: Physical Review E - Statistical, Nonlinear, and Soft Matter Physics. 2014 ; Vol. 89, No. 5.
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