Self-energy pole optimization of superconductivity in the bilayer Hubbard model

Taka-Shi Fujiwara; Shiro Sakai; Ryotaro Arita

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arXiv · 2607.24549

Self-energy pole optimization of superconductivity in the bilayer Hubbard model

Taka-Shi Fujiwara·Shiro Sakai·Ryotaro Arita

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Abstract

We study the real-frequency structure of the self-energy in the bilayer Hubbard model, using the dynamical cluster approximation. At half filling, the Mott insulator-band insulator (MI-BI) crossover involves a rearrangement of self-energy poles between the bonding and antibonding bands; these poles cross as the interlayer hopping $t_{\perp}$ is varied. Upon doping, this pole structure produces a band-selective pseudogap and enhances $s^{\pm}$-wave superconductivity. The order parameter is maximized near the MI-BI boundary, where low-energy anomalous self-energy poles develop simultaneously in both bands and cooperatively enhance the pairing. We further show that these self-energy poles can be interpreted as emergent fermionic excitations, offering an enhanced-pairing mechanism in common with the single-layer Hubbard model. The controllability of these poles through $t_{\perp}$ makes the bilayer system an unconventional platform for optimizing strongly correlated superconductivity.

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Taka-Shi Fujiwara, Shiro Sakai, Ryotaro Arita. 2026-07-27. Self-energy pole optimization of superconductivity in the bilayer Hubbard model. https://arxiv.org/abs/2607.24549

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