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Ferromagnetism in the Hubbard model: Spin waves and instability of the Nagaoka state

✍ Scribed by P. Wurth; E. Müller-Hartmann

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
660 KB
Volume
507
Category
Article
ISSN
0003-3804

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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