Itinerant and localized states in strongly correlated systems by a modified mean-field slave-boson approach

Details Itinerant and localized states in strongly correlated systems by a modified mean-field slave-boson approach Itinerant and localized states in strongly correlated systems by a modified mean-field slave-boson approach

2001-02-06

arxiv.org/abs/cond-mat/0102106v1

Int. Journ. Mod. Phys. B 15, 479 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

2 eps figure enclosed, IJMP B style, accepted for publication on Int. Journ. Mod. Phys. B

Scientific paper

10.1142/S0217979201004617

The standard mean field slave-boson solution for the infinite-$U$ Hubbard model is revised. A slightly modified version is proposed which includes properly the incoherent contribution of the localized states. In contrast to the standard mean field result, this new proposed solution defines a unique spectral function to be used in the calculation of local and not local quantities, and satisfies the correct thermodynamic relations. The same approach is applied also to the mean field approximation in terms of Hubbard operators. As a byproduct of this analysis, Luttinger's theorem is shown to be fulfilled in a natural way.

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