Interlayer Pairing in Bilayer Nickelates
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908399750348800 |
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| author | Maier, Thomas A. Doak, Peter Lin, Ling-Fang Zhang, Yang Moreo, Adriana Dagotto, Elbio |
| author_facet | Maier, Thomas A. Doak, Peter Lin, Ling-Fang Zhang, Yang Moreo, Adriana Dagotto, Elbio |
| contents | The discovery of $T_c\sim 80$~K superconductivity in pressurized La$_3$Ni$_2$O$_7$ has launched a new platform to study high-temperature superconductivity. Using non-perturbative dynamic cluster approximation quantum Monte Carlo calculations, we characterize the magnetic and superconducting pairing behavior of a realistic bilayer two-orbital Hubbard-Hund model of this system that describes the relevant Ni $e_g$ states with physically relevant interaction strengths. We find a leading $s^\pm$ superconducting instability in this model and show that this state primarily arises from interlayer pairing in the $d_{3z^2-r^2}$ orbital that is driven by strong interlayer spin-fluctuations in that orbital. These results provide non-perturbative evidence supporting the picture that a simple single-orbital bilayer Hubbard model for the Ni $d_{3z^2-r^2}$ orbital provides an excellent low-energy effective description of the superconducting behavior of La$_3$Ni$_2$O$_7$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_07741 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Interlayer Pairing in Bilayer Nickelates Maier, Thomas A. Doak, Peter Lin, Ling-Fang Zhang, Yang Moreo, Adriana Dagotto, Elbio Strongly Correlated Electrons Superconductivity The discovery of $T_c\sim 80$~K superconductivity in pressurized La$_3$Ni$_2$O$_7$ has launched a new platform to study high-temperature superconductivity. Using non-perturbative dynamic cluster approximation quantum Monte Carlo calculations, we characterize the magnetic and superconducting pairing behavior of a realistic bilayer two-orbital Hubbard-Hund model of this system that describes the relevant Ni $e_g$ states with physically relevant interaction strengths. We find a leading $s^\pm$ superconducting instability in this model and show that this state primarily arises from interlayer pairing in the $d_{3z^2-r^2}$ orbital that is driven by strong interlayer spin-fluctuations in that orbital. These results provide non-perturbative evidence supporting the picture that a simple single-orbital bilayer Hubbard model for the Ni $d_{3z^2-r^2}$ orbital provides an excellent low-energy effective description of the superconducting behavior of La$_3$Ni$_2$O$_7$. |
| title | Interlayer Pairing in Bilayer Nickelates |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2506.07741 |