Electronic transport in disordered interacting systems

Abstract

We numerically investigate the transport properties of disordered interacting electrons in three dimensions in the metallic as well as in the insulating phases. The disordered many-particle problem is modeled by the quantum Coulomb glass which contains a random potential, long-range unscreened Coulomb i n teractions and quantum hopping between dierent sites. We h a ve recently developed the Hartree-Fock based diagonalization (HFD) method which amounts to diagonalizing the Hamiltonian in a suitably chosen energetically truncated basis. This method allows us to investigate comparatively large systems.Here we calculate the combined eect of disorder and interactions on the dissipative conductance. We nd that the qualitative inuence of the interactions on the conductance depends on the relative disorder strength. For strong disorder interactions can signicantly enhance the transport while they suppress the conductance for weak disorder.