Superconducting landscape of the strongly correlated bilayer Hubbard model
Abstract
Coupling two strongly correlated layers opens a distinct route to repulsion-driven superconductivity. Yet the same interlayer coupling makes the optimization of superconductivity highly nontrivial. Using the dynamical vertex approximation, we determine the superconducting landscape in the enlarged parameter space spanned by filling and interlayer hopping. We identify an optimal regime at intermediate interlayer hopping and moderate doping away from half filling, where the system exhibits high superconducting transition temperatures (Tc) with an interband s±-wave gap structure. Toward half filling, however, strong self-energy effects can suppress the superconducting tendency by reducing the low-energy spectral weight. We further show that a Fermi-surface distortion induced by longer-range hoppings can weaken this suppression and enhance Tc. Our results establish how filling, interlayer hopping, and Fermi-surface geometry jointly optimize the superconducting regime in the strongly correlated bilayer Hubbard model.
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BibTeX
@misc{kitatani2026superconducting,
title = {{Superconducting landscape of the strongly correlated bilayer Hubbard model}},
author = {Motoharu Kitatani and Yusuke Nomura and Shiro Sakai and Ryotaro Arita},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.04855},
eprint = {2610.04855},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.04855},
}
RIS
TY - UNPB
TI - Superconducting landscape of the strongly correlated bilayer Hubbard model
AU - Motoharu Kitatani
AU - Yusuke Nomura
AU - Shiro Sakai
AU - Ryotaro Arita
PY - 2026
DA - 2026/10/04
PB - arXiv
DO - 10.48550/arxiv.2610.04855
UR - https://arxiv.org/abs/2610.04855
AB - Coupling two strongly correlated layers opens a distinct route to repulsion-driven superconductivity. Yet the same interlayer coupling makes the optimization of superconductivity highly nontrivial. Using the dynamical vertex approximation, we determine the superconducting landscape in the enlarged parameter space spanned by filling and interlayer hopping. We identify an optimal regime at intermediate interlayer hopping and moderate doping away from half filling, where the system exhibits high superconducting transition temperatures (T_c) with an interband s_±-wave gap structure. Toward half filling, however, strong self-energy effects can suppress the superconducting tendency by reducing the low-energy spectral weight. We further show that a Fermi-surface distortion induced by longer-range hoppings can weaken this suppression and enhance T_c. Our results establish how filling, interlayer hopping, and Fermi-surface geometry jointly optimize the superconducting regime in the strongly correlated bilayer Hubbard model.
ER -