Spin fluctuations in disordered interacting electrons

Abstract

The recent solution by Finkel'shtein of a model of two-dimensional interacting disordered electrons is reconsidered. The scaling equation requires a small modification, with the result that the conductivity remains finite down to zero temperature instead of going to infinity as envisaged by Finkel'shtein. Strong divergence in the spin susceptibility and a vanishing of the spin-diffusion constant are found at low temperatures. We also discuss the possibility that the spin fluctuation may lead to crossover to the high magnetic field or singlet-only universality classes, restoring the metal-insulator transition.