2000 character limit reached
A field-theoretical approach to the extended Hubbard model (1002.0254v1)
Published 1 Feb 2010 in cond-mat.supr-con and cond-mat.str-el
Abstract: We transform the quartic Hubbard terms in the extended Hubbard model to a quadratic form by making the Hubbard-Stratonovich transformation for the electron operators. This transformation allows us to derive exact results for mass operator and charge-charge and spin-spin correlation functions for s-wave superconductivity. We discuss the application of the method to the d-wave superconductivity.
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