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

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

1996-12-18

arxiv.org/abs/cond-mat/9612166v2

Physics

Condensed Matter

Superconductivity

9 pages including 5 eps figures, uses revtex and epsfig

Scientific paper

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 $\chi(q)$ 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 $(\pi,0)$ and $(0,\pi)$ 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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