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Enhancedd-wave pairing in the two-dimensional Hubbard model with periodically modulated hopping amplitudes
Shuhui Yang1, Xingcan Liu1, Weiqi Li2
1Institute of Modern Optics, School of Physics, Harbin Institute of Technology, Harbin 150001, People's Republic of China.
Abstract:
Utilizing determinant quantum Monte Carlo algorithm, the evolution of thed-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 thexˆ-direction, while in theyˆ-direction the hopping amplitudes are modulated with periodP, wherety=t+dt,ty'=t-(P-1)dt, and the modulation periodPequals 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 periodsP, we find that the modulated hopping inhomogeneity enhances thed-wave pairing and an optimal inhomogeneity exists.
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