Abstract
Abstract The electrical conductivity of disordered systems in the non-ohmic regime has been calculated using the Green function formalism of Movaghar et al. The isotropic and directed hopping cases are treated. For the temperature-related behaviour, we find as particular cases the Mott ¼ and the ½ laws, and for the electrical-field-related behaviour, we find a general form that agrees with expressions in the literature.
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