Flexoelectricity and competition of time scales in electroconvection

Details Flexoelectricity and competition of time scales in electroconvection Flexoelectricity and competition of time scales in electroconvection

2008-04-03

arxiv.org/abs/0804.0515v1

Physics

Condensed Matter

Soft Condensed Matter

13 pages, 14 figures, submitted

Scientific paper

10.1103/PhysRevE.78.036306

Novel behavior in electroconvection (EC) has been detected in nematic liquid crystals (NLCs) under the condition of comparable timescales of the director relaxation and the period of the driving ac voltage. The studied NLCs exhibit standard EC (s-EC) at the onset of the instability, except one compound in which nonstandard EC (ns-EC) has been detected. In the relevant frequency region, the threshold voltage for conductive s-EC bends down considerably, while for dielectric s-EC it bends up strongly with the decrease of the driving frequency. We show that inclusion of the flexoelectric effect into the theoretical description of conductive s-EC leads to quantitative agreement, while for dielectric s-EC a qualitative agreement is achieved. The frequency dependence of the threshold voltage for ns-EC strongly resembles that of the dielectric s-EC.

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