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• W4200230498 abstract "Fully occupied or unoccupied bands in a solid are often considered inert and irrelevant to a material's low-energy properties. But the discovery of enhanced superconductivity in heavily electron-doped FeSe-derived superconductors poses questions about the possible role of incipient bands (those laying close to but not crossing the Fermi level) in pairing. To answer this question, researchers have studied pairing correlations in the bilayer Hubbard model, which has an incipient band for large interlayer hopping ${t}_{ensuremath{perp}}$, using many-body perturbation theory and variational methods. They have generally found that superconductivity is enhanced as one of the bands approaches the Lifshitz transition and even when it becomes incipient. Here we address this question using the nonperturbative quantum Monte Carlo (QMC) dynamical cluster approximation (DCA) to study the bilayer Hubbard model's pairing correlations. We find that the model has robust ${s}^{ifmmodepmelsetextpmfi{}}$ pairing correlations in the large ${t}_{ensuremath{perp}}$ limit, which can become stronger as one band is made incipient. While this behavior is linked to changes in the effective interaction, we further find that it is counteracted by a suppression of the intrinsic pair-field susceptibility and does not translate to an increased ${T}_{c}$. Our results demonstrate that the highest achievable transition temperatures in the bilayer Hubbard model occur when the system has two bands crossing the Fermi level." @default.
• W4200230498 created "2021-12-31" @default.
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• W4200230498 date "2021-12-06" @default.
• W4200230498 modified "2023-09-26" @default.
• W4200230498 title "Superconductivity in the bilayer Hubbard model: Two Fermi surfaces are better than one" @default.
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• W4200230498 doi "https://doi.org/10.1103/physrevb.104.245109" @default.
• W4200230498 hasPublicationYear "2021" @default.
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