Large-N expansion based on the Hubbard-operator path integral representation and its application to the t-J model
Adriana Foussats, Andres Greco
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.
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