The field-dependence of the conductivity for the high-temperature small-polaron hopping regime in disordered systems

The effect of the electric field on the DC hopping conductivity in disordered systems has been investigated by various workers. In their studies the lattice deformation due to the presence of the carrier has not been taken into account. The author examines the effect of the electric field on the conductivity of the high-temperature multi-phonon-assisted small-polaron hopping regime, where the deformation of the surroundings induced by the carrier is a basic ingredient of the theory. The field-dependence of the DC conductivity is obtained.