New Scenarios in the Electroconvection of a Homeotropic Nematic Liquid Crystal

Nándor Éber Research Institute for Solid State Physics and Optics of the Hungarian Academy of Sciences, H-1525, Budapest, P.O.Box 49, Hungary; E-mail: [email protected]

Axel Rossberg Institute of Physics, Kyoto University, Kyoto, 606-8502, Japan

Ágnes Buka Research Institute for Solid State Physics and Optics of the Hungarian Academy of Sciences, H-1525, Budapest, P.O.Box 49, Hungary

Lorenz Kramer Institute of Physics, University of Bayreuth, Universitätstr. 30, D-95440, Bayreuth, Germany

Abstract

Unusual electroconvection scenarios have been found in a homeotropic nematic liquid crystal subjected to a small magnetic field: two Lifshitz frequencies, oscillations between pattern free state and chaos, and CRAZY rolls. The variation of the azimuthal angle of the director has been measured around the normal roll—abnormal roll transition at various frequencies. Experimental results agree well with theoretical expectations. A model is proposed to describe the structure of CRAZY rolls.

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New Scenarios in the Electroconvection of a Homeotropic Nematic Liquid Crystal

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