Electrical conductivity and resonant states of doped graphene   considering next-nearest neighbor interaction
  The next-nearest neighbor interaction (NNN) is included in a tight-binding calculation of the electronic spectrum and conductivity of doped graphene. As a result, we observe a wide variation of the conductivity behavior, since the Fermi energy and the resonance peak are not shifted by the same amount. Such effect can have a profound effect in the idea of explaining the minimal conductivity of graphene as a consequence of impurities or defects. Finally, we also estimate the mean free path and relaxation time due to resonant impurity scattering. 
J.E. Barrios-Vargas and Gerardo G Naumis
cond-mat.mtrl-sci cond-mat.mes-hall