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Quantum Monte Carlo is used to investigate the possibility of d_{x^2-y^2}superconductivity in the two-dimensional repulsive Hubbard model. A smallenergy scale relevant to possible pairing requires a care (i.e., sufficientlysmall level separation between the $k$ points $(\delta k,\pi-\delta k')$ and$(\pi-\delta k'',\delta k''')$ with small $\delta k$'s) to detect enhancedcorrelations in finite-size studies, as motivated from a previous study onHubbard ladders. Our calculation indeed detects long-tailed enhancements in thed_{x^2-y^2} pairing correlation when the system is near, but not exactly at,half-filling.Comment: 4 pages, RevTeX, uses epsf.sty and multicol.st

physical review. b, condensed matter

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

Enhancement of thedx2−y2pairing correlation in the two-…