Drastic enhancement of d-wave superconductivity in an extended checkerboard Hubbard model
Kai Cheng, Shi-Chao Fang, Zhong-Bing Huang
DOI 10.1103/PhysRevB.109.014519 · Physical Review B
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Abstract
Motivated by the recent discovery of anomalously strong nearest-neighbor attraction in the one-dimensional hole-doped cuprate Ba2+xSrxCuO3+δ, we investigate the d-wave superconducting property of an extended checkerboard Hubbard model, which includes an intraplaquette nearest-neighbor attraction V. Our quantum Monte Carlo simulations reveal that, for small interplaquette hopping integral t′, V induces a drastic enhancement of long-range d-wave pairing correlations in the parameter range of 0.0≤U≤6.0t (t is the intraplaquette hopping integral) when the electron density lies between half-filling and quarter-filling. At V=−0.4t, one order of magnitude larger d-wave pairing correlations are observed compared to the ones at V=0.0t and, more importantly, they exceed the values of the free electron system, signifying the existence of d-wave superconductivity. The exact diagonalization calculations on the 2×2 plaquette indicate that the enhancement of d-wave pairing correlations can be attributed to the V-induced enhancement of pair-binding energy. Our findings provide a new perspective on the realization of high-temperature d-wave superconductivity via the combination of nearest-neighbor attraction and electronic inhomogeneity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba2+xSrxCuO3+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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