Negative Differential Conductivity in Carbon Nanotubes in the Presence of an External Electric Field
Abstract
We study theoretically the electron transport properties in carbon nanotubes under the influence of an external electric field E(t) using Boltzmann's equation. The current-density equation is derived. Negative differential conductivity is predicted when ωτ<<1 (quasi-static case). We observed this in the neighbourhood where the constant electric field Eo is equal to the amplitude of the AC electric field E1 and the peak decreases with increasing E1. This phenomenon can also be used for the generation of terahertz radiation without electric current instability.
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