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A simple case of d (x 2- y 2) pairing: Hubbard ladder
We study the strength and the temperature scale of the d(x 2-y2) pairing correlations in the Hubbard model on a ladder lattice using Quantum Monte Carlo (QMC) simulations. In particular, we present QMC results on the particle-particle interaction and the solution of the Bethe-Salpeter equation for the d(x2-y2)-wave BCS channel. These data show that there are strong d(x2-y2) pairing correlations in the Hubbard ladder for certain values of the model parameters. © Owned by the authors, published by EDP Sciences, 2012.