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  • Letter
  • Open Access

Strong-coupling high-Tc superconductivity in doped correlated band insulators

Yusuke Nomura1,*, Motoharu Kitatani2, Shiro Sakai3,4, and Ryotaro Arita4,5

  • *Contact author: yusuke.nomura@tohoku.ac.jp
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Phys. Rev. B 112, L020504 – Published 17 July, 2025

DOI: https://doi.org/10.1103/dygc-94fq

Abstract

We explore the superconducting properties of the bilayer Hubbard model, which exhibits a high transition temperature (Tc) for an s± pairing, using a cluster extension of the dynamical mean-field theory. Unlike the single-layer Hubbard model, where the d-wave superconductivity emerges by doping the Mott insulator, the parent state of the bilayer system is a correlated band insulator. Above Tc, slight hole (electron) doping introduces a striking dichotomy between electron and hole pockets: The electron (hole) pocket develops a pseudogap while the other becomes a nearly incipient band. We reveal that the superconductivity is driven by kinetic (potential) energy gain in the underdoped (overdoped) region. We also find a very short coherence length, for which we argue the relevance to multiorbital physics. Our Letter offers crucial insights into the superconductivity in the bilayer Hubbard model potentially relevant to La3Ni2O7.

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Phys. Rev. B 112, L020504– Published 17 July, 2025
  • Received 22 February 2025
  • Revised 16 May 2025
  • Accepted 18 June 2025
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