Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 34, Issue 37, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-648X/au7e9c
Keywords
Hubbard model; hopping inhomogeneity; d-wave pairing; quantum Monte Carlo
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Funding
- Natural Science Foundation of Chongqing, China [cstc2021jcyj-msxmX1009]
- Natural Science Foundation of Heilongjiang Province [LH2019A011]
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By studying the effect of periodically modulated hopping amplitudes on the d-wave pairing in the Hubbard model on a square lattice, it is found that the modulation enhances the d-wave pairing and there exists an optimal inhomogeneity.
Utilizing determinant quantum Monte Carlo algorithm, the evolution of the d-wave pairing in the Hubbard model on the square lattice tuned by the periodically modulated hopping amplitudes is studied. The hopping amplitudes are homogeneous in the (x) over cap -direction, while in the (y) over cap -direction the hopping amplitudes are modulated with period P, where t(y) = t + dt, t(y)' = t - (P - 1)dt, and the modulation period P equals 2, 3 and 4 lattice spacings. The latter two modulation periods are motivated by the observation of period-3 and period-4 stripe order in cuprate superconductors. For all the periods P, we find that the modulated hopping inhomogeneity enhances the d-wave pairing and an optimal inhomogeneity exists.
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