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- W1969928611 abstract "The influence of on-site (Hubbard) electron-electron interactions on disorder-induced localization is studied in order to clarify the role of electronic spin. The motivation is based on the recent experimental indications of a ``metal-insulator'' transition in two-dimensional systems. We use both analytical and numerical techniques, addressing the limit of weak short-range interactions. The analytical calculation is based on random matrix theory (RMT). We demonstrate that, at least in the diffusive regime, delocalization can indeed be induced by electron-electron interactions and that an in-plane magnetic field has a strong influenece on this effect. It is found that although RMT gives a qualitative explanation of the numerical results, it is quantitatively incorrect. This is due to an exact cancellation of short-range and long-range correlations in RMT, which does not occur in the nonuniversal corrections to RMT. An estimate for these contributions is given." @default.
- W1969928611 created "2016-06-24" @default.
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- W1969928611 date "2003-12-23" @default.
- W1969928611 modified "2023-09-24" @default.
- W1969928611 title "On-site interaction effects on localization: Dominance of nonuniversal contributions" @default.
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- W1969928611 doi "https://doi.org/10.1103/physrevb.68.245116" @default.
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