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

Yusuke Nomura; Motoharu Kitatani; Shiro Sakai; Ryotaro Arita

doi:10.1103/dygc-94fq

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

Yusuke Nomura, Motoharu Kitatani, Shiro Sakai, Ryotaro Arita

DOI 10.1103/dygc-94fq · Physical Review B

T1

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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.

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