The Moment Sum Rule and Its Consequences
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M. Potthoff; T. Herrmann; T. Wegner; W. Nolting
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Article
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1998
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John Wiley and Sons
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English
β 430 KB
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The sum rule for the moments of the spectral density is discussed for the single-band Hubbard model. It is shown that respecting the sum rule up to the order m 3 is conceptually important for a qualitatively correct description of the quasi-particle band structure in the strong-correlation regime. D