Superconductivity and magnetism in bilayer nickelates: itinerant perspective
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
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2026
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| author | Wu, Yi-Ming Helbig, Tobias Smailagić, Salahudin V. Wang, Hao-Xin Yu, Yijun Hwang, Harold Y. Raghu, Srinivas |
| author_facet | Wu, Yi-Ming Helbig, Tobias Smailagić, Salahudin V. Wang, Hao-Xin Yu, Yijun Hwang, Harold Y. Raghu, Srinivas |
| contents | We study superconductivity and magnetism in bilayer nickelates from an itinerant perspective. Starting from a tight binding fit to recent ARPES measurements on compressively strained thin films, we incorporate the standard set of onsite repulsive interactions among partially filled $e_g$ orbitals: intra-orbital $U$, inter-orbital $U'$, Hund's coupling $J_H$ and a pair hopping $J_P$. We obtain the effective pairing interaction by dressing these bare interactions with particle-hole fluctuations via the RPA. In the strong Hund's coupling regime, we find that $s$-wave superconductivity and $(π/2, π/2)$ SDW order are the favored ground states. With weaker Hund's coupling, we find that $d$-wave pairing and $(π, π)$ SDW are the leading ground states. Our results are qualitatively consistent with earlier DMRG studies, and point to the key role played by Hund's coupling in determining the nature of superconductivity and magnetism in this system. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_20288 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Superconductivity and magnetism in bilayer nickelates: itinerant perspective Wu, Yi-Ming Helbig, Tobias Smailagić, Salahudin V. Wang, Hao-Xin Yu, Yijun Hwang, Harold Y. Raghu, Srinivas Superconductivity Strongly Correlated Electrons We study superconductivity and magnetism in bilayer nickelates from an itinerant perspective. Starting from a tight binding fit to recent ARPES measurements on compressively strained thin films, we incorporate the standard set of onsite repulsive interactions among partially filled $e_g$ orbitals: intra-orbital $U$, inter-orbital $U'$, Hund's coupling $J_H$ and a pair hopping $J_P$. We obtain the effective pairing interaction by dressing these bare interactions with particle-hole fluctuations via the RPA. In the strong Hund's coupling regime, we find that $s$-wave superconductivity and $(π/2, π/2)$ SDW order are the favored ground states. With weaker Hund's coupling, we find that $d$-wave pairing and $(π, π)$ SDW are the leading ground states. Our results are qualitatively consistent with earlier DMRG studies, and point to the key role played by Hund's coupling in determining the nature of superconductivity and magnetism in this system. |
| title | Superconductivity and magnetism in bilayer nickelates: itinerant perspective |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2602.20288 |