Superconductivity in an imbalanced bilayer Hubbard model: Enhanced d-wave and weakened s±-wave pairing
Ziying Jia, Xun Liu, Mi Jiang
DOI 10.1103/j4v5-rgmm · Physical Review B
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Abstract
We investigate the bilayer model with two layers of imbalanced densities coupled by interlayer hybridization. Using the large-scale dynamical cluster quantum Monte Carlo simulation, we discovered that increased hybridization induces a transition in the superconducting pairing from d wave to s± wave and the superconducting Tc of d-wave pairing exhibits a nonmonotonic dependence on the density imbalance. Remarkably, optimal superconductivity (SC) occurs at a moderate imbalance. Our results support the possibility of Tc enhancement in a composite picture where the underdoped layer provides pairing strength while the overdoped layer promotes phase coherence. In addition, the SC can be possibly hosted by a single layer, which is reminiscent of our recent exploration on the trilayer Hubbard model. Our present study thus provides insight that the SC can be enhanced via the layer differentiation.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La3Ni2O7 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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