Determinant Quantum Monte Carlo Study of the Screening of the One Body Potential near a Metal-Insulator Transition
P. B. Chakraborty, P. J. H. Denteneer, R. T. Scalettar
Abstract
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 Uc. 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 Uc, the conductivity is maximal in the metallic phase just beyond Uc, and decreases for larger correlation.
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