Direct transition to electroconvection in a homeotropic nematic liquid crystal

A. Buka, B. Dressel, L. Kramer, W. Pesch

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We present an experimental and theoretical investigation of a variant of electroconvection using an unusual nematic liquid crystal in an isotropic configuration (homeotropic alignment). The significance of the system is a direct transition to the convecting state due to the negative conductivity anisotropy and positive dielectric anisotropy. We observe at onset rolls or squares depending on the frequency and amplitude of the applied ac voltage with a strong signature of the zigzag instability. Good agreement with calculations based on the underlying hydrodynamic theory is found. We also construct an extended Swift-Hohenberg model which allows us to capture complex patterns like squares with a quasiperiodic modulation.

Original languageEnglish
Pages (from-to)793-802
Number of pages10
JournalChaos
Volume14
Issue number3
DOIs
Publication statusPublished - Sep 2004

Fingerprint

Nematic liquid crystals
Nematic Liquid Crystal
Anisotropy
liquid crystals
anisotropy
Zigzag
Conductivity
Hydrodynamics
Alignment
Modulation
Signature
Voltage
alignment
hydrodynamics
signatures
modulation
conductivity
Configuration
Electric potential
electric potential

ASJC Scopus subject areas

  • Applied Mathematics
  • Mathematical Physics
  • Physics and Astronomy(all)
  • Statistical and Nonlinear Physics

Cite this

Direct transition to electroconvection in a homeotropic nematic liquid crystal. / Buka, A.; Dressel, B.; Kramer, L.; Pesch, W.

In: Chaos, Vol. 14, No. 3, 09.2004, p. 793-802.

Research output: Contribution to journalArticle

Buka, A. ; Dressel, B. ; Kramer, L. ; Pesch, W. / Direct transition to electroconvection in a homeotropic nematic liquid crystal. In: Chaos. 2004 ; Vol. 14, No. 3. pp. 793-802.
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