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The dc-conductivity of electrons on a square lattice interacting with a localrepulsion in the presence of disorder is computed by means of quantum MonteCarlo simulations. We provide evidence for the existence of a transition froman Anderson insulator to a correlated disordered metal with a universal valueof the critical dc-conductivity \sigma_{dc,crit} = (1.18 \pm 0.06) e^{2}/h atthe transition.

physical review. b, condensed matter and materials physics

Interacting lattice electrons with disorder in two dimensions: Numerical  evidence for a metal-insulator transition with a universal critical  conductivity