4.6 Article

Two-dimensional extended Hubbard model at half-filling

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Summary: A new method is suggested to estimate parameters for the two-dimensional Hubbard model to ensure the fulfillment of the Mermin-Wagner theorem in the strong coupling diagram technique (SCDT). The calculated magnetic quantities are in good agreement with experiment results, and the obtained spin and charge vertices are used to investigate superconductivity under strong correlations. While no superconducting transition is found in the t-U model, a transition occurs in the t-t'-t ''-U model at approximately T-c=0.016t. The difference between the two models lies in the renormalized hopping parameters describing electron motion in SCDT.

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