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- W1670036763 abstract "(February 1, 2008)We use the moment approach of Nolting (exact sum rules) (Z. Physik 255, 25 (1972)) for theattractive Hubbard model in the superconducting phase. Our diagonal and off - diagonal spectralfunctions are constructed and evaluated with the sum rules. They reduce to the BCS limit forweak interaction. However, the presence of correlations modify the BCS picture dramatically. Forexample, due to the presence of correlations we have postulated a three - pole ansatz for the diagonalGreen function, G(~k,ω ), while the off - diagonal one, B(~k,ω ), is supposed to have two poles. Inthe paper we present results for the three spectral weights of the diagonal Green function, α" @default.
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- W1670036763 date "1997-10-04" @default.
- W1670036763 modified "2023-09-27" @default.
- W1670036763 title "The Two - Dimensional Attractive Hubbard Model: Highly Non-Linear Superconductivity With Sum Rules" @default.
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