Metal-Insulator Transition of Disordered Interacting Electrons
  We calculate the corrections to the conductivity and compressibility of a disordered metal when the mean free path is smaller than the screening length. Such a condition is shown to be realized for low densities and large disorder. Analysis of the stability of the metallic state reveals a transition to the insulating state in two-dimensions. 
Qimiao Si (Rice) and C. M. Varma (Lucent)