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Physics Letters A

Effect of hopping anisotropy on the d-wave pairing in the Hubbard model: From two-leg ladder to square lattice

Shuhui Yang, Hengyu Liu, Weiqi Li, Jianqun Yang, Tao Ying, Xingji Li, Xiudong Sun

Published Jul 13, 2022• 1 citation
Publisher
DOI
10.1016/j.physleta.2022.128316

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Antiferromagnetic and ${d}_{{x}^{2}\ensuremath{-}{y}^{2}}$-pairing correlations appear delicately balanced in the two-dimensional 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 HW{H}_{W}HW​ 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 is responsible for enhancing the pairing. Here we analyze these processes for a two-leg Hubbard ladder.