Static Screening and Delocalization Effects in the Hubbard-Anderson Model

Abstract

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 nonmonotonic 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.

7 pages, 5 figures, to be published in Phys. Rev. B, journal version

References in corpus (1)

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

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• Temperature dependence of the zero-bias anomaly in the Anderson-Hubbard model: Insights from an ensemble of two-site systems
• Non-Gaussian Spatial Correlations Dramatically Weaken Localization