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Monte Carlo study of the pairing interaction in the two-leg Hubbard ladder

N. Bulut·T. Dahm·D. J. Scalapino
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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 $χ(q)$ 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 $t_{\perp}/t\simeq 1.5$, leading to an increased tendency for pairing.

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N. Bulut, T. Dahm, D. J. Scalapino. 1996-12-19. Monte Carlo study of the pairing interaction in the two-leg Hubbard ladder. https://arxiv.org/abs/cond-mat/9612166

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