We perform a theoretical study of photocurrent of semiconducting single-walled carbon nanotubes (s-SWNTs) with lengths of the order of sub micrometers using the Keldysh nonequilibrium Green’s function method. We found that photocurrents in s-SWNTs exhibit periodic oscillations (i.e., the resistance varies periodically) as a function of length of the laser-irradiated region. To interpret this oscillating behavior, we derive the analytical expression for the photocurrent in the effective mass approximation.
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