Strong-coupling high-$T_{\rm c}$ superconductivity in doped correlated band insulators
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arXiv
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| Hauptverfasser: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866911065475907584 |
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| author | Nomura, Yusuke Kitatani, Motoharu Sakai, Shiro Arita, Ryotaro |
| author_facet | Nomura, Yusuke Kitatani, Motoharu Sakai, Shiro Arita, Ryotaro |
| contents | We explore the superconducting properties of the bilayer Hubbard model, which exhibits a high transition temperature ($T_{\rm c}$) for an $s_{\pm}$ 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 $T_{\rm c}$, 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 multi-orbital physics. Our study offers crucial insights into the superconductivity in the bilayer Hubbard model potentially relevant to La$_3$Ni$_2$O$_7$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_14601 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Strong-coupling high-$T_{\rm c}$ superconductivity in doped correlated band insulators Nomura, Yusuke Kitatani, Motoharu Sakai, Shiro Arita, Ryotaro Superconductivity Strongly Correlated Electrons We explore the superconducting properties of the bilayer Hubbard model, which exhibits a high transition temperature ($T_{\rm c}$) for an $s_{\pm}$ 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 $T_{\rm c}$, 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 multi-orbital physics. Our study offers crucial insights into the superconductivity in the bilayer Hubbard model potentially relevant to La$_3$Ni$_2$O$_7$. |
| title | Strong-coupling high-$T_{\rm c}$ superconductivity in doped correlated band insulators |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2502.14601 |