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With the use of the semiclassical Boltzmann equation we have calculated adirect current (d.c) in undoped zigzag carbon nanotube (CN) by mixing twocoherent electromagnetic waves with commensurate frequencies i.e and . Thiseffect is attributed to the nonparabolicity of the electron energy band whichis very strong in carbon nanotubes. We observed that the current is negativesimilar to that observed in superlattice. However if the phase shift liesbetween and there is an inversion and the current becomes positive. It isinteresting to note that exhibit negative differential conductivity as expectedfor d.c through carbon nanotubes. This method can be used to generate terahertzradiation in carbon nanotubes. It can also be used in determining therelaxation time of electrons in carbon nanotubes

Generation of Terahertz Radiation by Wave Mixing in Zigzag Carbon Nanotubes