Determinant Quantum Monte Carlo Study of the Screening of the One Body   Potential near a Metal-Insulator Transition
  In this paper we present a determinant quantum monte carlo study of the two dimensional Hubbard model with random site disorder. We show that, as in the case of bond disorder, the system undergoes a transition from an Anderson insulating phase to a metallic phase as the onsite repulsion U is increased beyond a critical value U_c. However, there appears to be no sharp signal of this metal-insulator transition in the screened site energies. We observe that, while the system remains metallic for interaction values upto twice U_c, the conductivity is maximal in the metallic phase just beyond U_c, and decreases for larger correlation. 
P. B. Chakraborty (1), P. J. H. Denteneer (2), R. T. Scalettar (1)   ((1) University of California, Davis, CA, USA, (2) Lore...