Four-wave resonance in electrohydrodynamic convection

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Abstract
The supercritical Hopf bifurcation to oblique traveling rolls in nematic liquid crystals leads to a complex spatiotemporal state. We present an experimental study of the bifurcation scenario in which a secondary bifurcation to a coherent steady state occurs at higher values of the control parameter. Temporal resonant modulation of the driving force can stabilize the four amplitude modes appearing after the first bifurcation, and their superposition can lead to a standing bimodal pattern.