External electric field effect on electron transport in carbon nanotubes
  Electronic transport properties of carbon nanotubes are studied theoretically in the presence of external electric field E(t) by using the Boltzmann's transport with constant relaxation time. An analytical expression for the current densities of the nanotubes are obtained. It is observed that the current density-electric field characteristics of the CNs exhibit total self-induced transparency and absolute negative conductivity 
S. S. Abukari, S. Y. Mensah, N. G. Mensah, M. Rabiu, K. W. Adu and A.   Twum
cond-mat.mes-hall