Coefficients of diffusion and conductivity of semiconductor carbon nanotubes in an external electric field

The coefficients of electron diffusion and conductivity have been calculated for single-layer semiconducting carbon nanotubes in an external electric field with the strength vector directed along the nanotube axis. The evolution of the electronic system of the nanotubes has been described using the Boltzmann kinetic equation in terms of the quasi-classical approximation of relaxation time. An analytical expression of the electron diffusion coefficient has been obtained, and its nonlinear field dependence has been revealed.