Determinant Quantum Monte Carlo Study of the Screening of the One Body Potential near a Metal-Insulator Transition

Details Determinant Quantum Monte Carlo Study of the Screening of the One Body Potential near a Metal-Insulator Transition Determinant Quantum Monte Carlo Study of the Screening of the One Body Potential near a Metal-Insulator Transition

2006-09-27

arxiv.org/abs/cond-mat/0609717v1

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 10 eps figures, Revtex4

Scientific paper

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.

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