Journals of the American Physical Society - Static screening and delocalization effects in the Hubbard-Anderson model

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December 2007, to be published in Physical Review B15

Static screening and delocalization effects in the Hubbard-Anderson model
Peter Henseler, Johann Kroha, and Boris Shapiro

We study the suppression of electron localization due to the screening of disorder in a Hubbard-Anderson model. We focus on the change of the electron localization length at the Fermi level within a static picture, where interactions are absorbed into the redefinition of the random on-site energies. Two different approximations are presented, either one yielding a non-monotonic dependence of the localization length on the interaction strength, with a pronounced maximum at an intermediate interaction strength. In spite of its simplicity, our approach is in good agreement with recent numerical results.

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