Delocalization, Inelastic Scattering and Transport due to Interactions

Abstract

The enhancement of electronic transport in the localized regime by the electron-electron interactions is discussed both in the incoherent channel, leading to transport via inelastic scattering, and in the coherent channel, via delocalization. For the former channel, a new prediction for the temperature dependence of the conductivity in a weak granular insulator is given. The conditions for an effective decay of a given state weakly coupled to a quasicontinuum are obtained. This is applied to both the decay of a single-electron excited state due to interactions and to interblock transport in the scaling theory of localization. Thus the latter theory can include some of the effects of the interactions. Two-electron delocalization is a good example for that, which is also treated in this paper. 83