Opposite-Mirror-Parity Scattering as the Origin of Superconductivity in Strained Bilayer Nickelates
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866908550594297856 |
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| author | Le, Congcong Zhan, Jun Wu, Xianxin Hu, Jiangping |
| author_facet | Le, Congcong Zhan, Jun Wu, Xianxin Hu, Jiangping |
| contents | We study the electronic structure and doping-dependent instabilities of strained La$_3$Ni$_2$O$_7$ thin films using first-principles and functional renormalization group methods. We demonstrate that ordering tendencies are governed by Fermi surface scattering between electrons of opposite mirror parity. Under moderate hole doping, when the $d_{z^2}$ bonding band becomes incipient or crosses the Fermi level, robust $s_{\pm}$-wave superconductivity emerges from cooperative interlayer pairing reinforced by two competing spin-density-wave fluctuations. Compressive strain favors superconductivity in NiO$_2$ bilayers slightly away from the interface, whereas tensile strain induces pair-breaking nesting that suppresses pairing. Our results establish a unified microscopic scenario for superconductivity in pressurized bulk and strained thin-film nickelates, providing new insights into high-T$_c$ pairing in correlated quantum materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_14665 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Opposite-Mirror-Parity Scattering as the Origin of Superconductivity in Strained Bilayer Nickelates Le, Congcong Zhan, Jun Wu, Xianxin Hu, Jiangping Superconductivity Strongly Correlated Electrons We study the electronic structure and doping-dependent instabilities of strained La$_3$Ni$_2$O$_7$ thin films using first-principles and functional renormalization group methods. We demonstrate that ordering tendencies are governed by Fermi surface scattering between electrons of opposite mirror parity. Under moderate hole doping, when the $d_{z^2}$ bonding band becomes incipient or crosses the Fermi level, robust $s_{\pm}$-wave superconductivity emerges from cooperative interlayer pairing reinforced by two competing spin-density-wave fluctuations. Compressive strain favors superconductivity in NiO$_2$ bilayers slightly away from the interface, whereas tensile strain induces pair-breaking nesting that suppresses pairing. Our results establish a unified microscopic scenario for superconductivity in pressurized bulk and strained thin-film nickelates, providing new insights into high-T$_c$ pairing in correlated quantum materials. |
| title | Opposite-Mirror-Parity Scattering as the Origin of Superconductivity in Strained Bilayer Nickelates |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2501.14665 |