Abstract
Monte Carlo calculations of the irreducible particle-particle interaction on a two-leg Hubbard ladder doped near half-filling are reported. As the temperature is lowered, this interaction develops structure in momentum space similar to the magnetic susceptibility ξ( q) and reflects the development of strong short-range antiferromagnetic correlations. Using this interaction, the eigenfunction of the leading singlet pair eigenvalue is found to have d x 2− y 2- -like symmetry. The single-particle spectral weight is also shown to peak near (π,0) and (0,π) when the ratio of the inter- to intra-chain hopping t f t ≈ 1.5 , leading to an increased tendency for pairing.
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