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Generation of direct current in zigzag carbon nanotubes due to harmonicmixing of two coherent electromagnetic waves is being considered. Theelectromagnetic waves have commensurate frequencies of omega and two omega. Therectification of the waves at high frequencies is quite smooth whiles at lowfrequencies there are some fluctuations. The nonohmicity observed in theI-Vcharacteristics is attributed to the nonparabolicity of the electron energyband which is very strong in carbon nanotubes because of high stark component.It is observed that the current falls off faster at lower electric field thanthe case in superlattice. For omega tau equal to two? the external electricfield strength Emax for the observation of negative differential conductivityoccurs around 1.03x10e6 V/m which is quite weak. It is interesting to note thatthe peak of the curve shifts to the left with increasing value of omega tau?

Direct current generation due to wave mixing in zigzag carbon nanotubes