Abstract
Nematic electroconvection is studied under asymmetric periodic excitation with a driving electric field E(t)=E(t+T) not equal -E(t+T/2). A new dynamic regime, distinguished by subharmonic dynamics, is discovered in the pattern state diagram between conventional conductive and dielectric regimes. The spatial and temporal pattern characteristics are investigated experimentally. The dynamics, threshold fields, and selected pattern wavelengths at onset, calculated from a Floquet analysis of the linearized electrohydrodynamic equations with a test mode ansatz, are in good agreement with experimental results.
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