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Electron-electron correlations in non-equilibrium hopping transport

Abstract Electron-electron interaction effects are expected to be prominent in the insulating regime because of lack of screening. One of the well-known consequences of interactions is the Coulomb gap, first discussed by Pollak. The contribution of these effects however, is not always readily recognized in the near-equilibrium properties of hopping systems. Here we review some examples of transport properties of such systems driven far from equilibrium and discuss the role played by interactions.