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Large-N expansion based on the Hubbard-operator path integral representation and its application to the $t-J$ model | | Adriana Foussats
; Andres Greco
; | | Date: |
12 Mar 2002 | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Abstract: | In the present work we have developed a large-N expansion for the $t-J$ model based on the path integral formulation for Hubbard-operators. Our large-N expansion formulation contains diagrammatic rules, in which the propagators and vertex are written in term of Hubbard operators. Using our large-N formulation we have calculated, for J=0, the renormalized $O(1/N)$ boson propagator. We also have calculated the spin-spin and charge-charge correlation functions to leading order 1/N. We have compared our diagram technique and results with the existing ones in the literature. | | Source: | arXiv, cond-mat/0203258 | | Services: | Forum | Review | PDF | Favorites | |
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