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In the ground state of the doped two-leg Hubbard ladder there are power-lawdecaying d_{x^2-y^2}-type pairing correlations. It is important to know thestrength and the temperature scale of these correlations. For this purpose, wehave performed determinantal Quantum Monte Carlo (QMC) calculations of thereducible particle-particle interaction in the Hubbard ladder. In this paper,we report on these calculations and show that, at sufficiently lowtemperatures, resonant particle-particle scattering takes place in thed_{x^2-y^2} pairing channel for certain values of the model parameters. The QMCdata presented here indicate that the d_{x^2-y^2} pairing correlations arestrong in the Hubbard ladder.Comment: 5 pages, 5 figure

physical review. b, condensed matter and materials physics

Strength of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>d</mml:mi><mml:mrow><mml:msup><mml:mi>x</mml:mi><mml:mn>2</mml:mn></mml:msup><mml:mo>−</mml:mo><mml:msup><mml:mi>y</mml:mi><mml:mn>2</mml:mn></mml:msup></mml:mrow></mml:msub></mml:mrow></mml:math>pairing in the two-leg Hubbard ladder

Strength ofdx2−y2pairing in the two-leg Hubbard ladder