The irreducible particle-particle interaction ΓI of the two-dimensional Hubbard model is calculated by quantum Monte Carlo simulations. The Bethe-Salpeter equation for the pair-wave function is then solved using the Monte Carlo data for ΓI and the single-particle Green's function. The dominant pairing correlations in the intermediate-coupling regime and at small dopings are discussed.
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Bulut et al. (1993) studied this question.
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