Oblique-roll electrohydrodynamic instability in nematics

Walter Zimmermann and Lorenz Kramer
Phys. Rev. Lett. 55, 402 – Published 22 July 1985
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A three-dimensional analysis of the electrohydrodynamic instability in a planar-oriented nematic liquid crystal with stress-free boundary conditions shows that for appropriate, realistic parameters of materials like MBBA and PAA the instability sets in for a periodic roll structure that is oblique with respect to the undisturbed director nbhat. By a change in the frequency and/or application of a magnetic field a continuous transition from perpendicular to oblique rolls can be induced. We analyze the mechanism, discuss the possible influence of nonlinearities, and compare with experiments.

  • Received 22 March 1985


©1985 American Physical Society

Authors & Affiliations

Walter Zimmermann and Lorenz Kramer

  • Physikalisches Institut der Universitat Bayreuth, 8580 Bayreuth, Federal Republic of Germany

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Vol. 55, Iss. 4 — 22 July 1985

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