Static Screening and Delocalization Effects in the Hubbard-Anderson Model

Details Static Screening and Delocalization Effects in the Hubbard-Anderson Model Static Screening and Delocalization Effects in the Hubbard-Anderson Model

2007-07-09

arxiv.org/abs/0707.1301v2

Phys. Rev. B 77, 075101 (2008)

Physics

Condensed Matter

Disordered Systems and Neural Networks

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

Scientific paper

10.1103/PhysRevB.77.075101

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.

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