Effect of the W-term for a t-U-W Hubbard ladder

Details Effect of the W-term for a t-U-W Hubbard ladder Effect of the W-term for a t-U-W Hubbard ladder

1999-11-18

arxiv.org/abs/cond-mat/9911290v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.61.15526

Antiferromagnetic and d_{x2-y2}-pairing correlations appear delicately balanced in the 2D Hubbard model. Whether doping can tip the balance to pairing is unclear and models with additional interaction terms have been studied. In one of these, the square of a local hopping kinetic energy H_W was found to favor pairing. However, such a term can be separated into a number of simpler processes and one would like to know which of these terms are responsible for enhancing the pairing. Here we analyze these processes for a 2-leg Hubbard ladder.

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