Generalization of Luttinger's Theorem for Strongly Correlated Electron Systems

Details Generalization of Luttinger's Theorem for Strongly Correlated Electron Systems Generalization of Luttinger's Theorem for Strongly Correlated Electron Systems

2004-05-11

arxiv.org/abs/cond-mat/0405207v1

Phys. Solid State, Vol. 45, No. 8, 2003, pp. 1415-1422 [Fiz. Tverdogo Tela, Vol. 45, No. 8, 2003, pp. 1351-1357]

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 3 figures

Scientific paper

10.1134/1.1602872

Analyzing general structure of the Green function of a strongly correlated electron system we have shown that for the regime of strong correlations Luttinger's theorem should be generalized in the following way: the volume of the Fermi surface of the system of noninteracting particles is equal to volume of the Fermi surface of the quasiparticles in the strongly correlated system with account for the spectral weight of these quasiparticles. Hubbard and t-J models analysis in the paramagnetic nonsuperconducting phase shows that the generalized Luttinger's theorem is valid for these models.

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