$η$-pairing in a two-band model of spinless fermions
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arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866914501106860032 |
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| author | Karnaukhov, Igor N. |
| author_facet | Karnaukhov, Igor N. |
| contents | We study the two-band model of spinless fermions in which itinerant fermions interact with localized fermions through the two-particle hybridization. In 1D version, the model has exact solution using the Bethe ansatz. It has been shown that accounting for two-particle hybridization reduces the repulsive interaction between itinerant fermions. In the case of strong interaction, the effective interaction between itinerant fermions is attractive, and $η$-pairing of spinless fermions is realized. The proposed pairing mechanism via two-particle hybridization can lead to $p$-superconducting states with $η$-pairing. $η$-pairing of spinless fermions could explain the phenomenon of high-temperature superconductivity experimentally observed in hydrogen-rich materials at high pressures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_21318 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | $η$-pairing in a two-band model of spinless fermions Karnaukhov, Igor N. Strongly Correlated Electrons Superconductivity We study the two-band model of spinless fermions in which itinerant fermions interact with localized fermions through the two-particle hybridization. In 1D version, the model has exact solution using the Bethe ansatz. It has been shown that accounting for two-particle hybridization reduces the repulsive interaction between itinerant fermions. In the case of strong interaction, the effective interaction between itinerant fermions is attractive, and $η$-pairing of spinless fermions is realized. The proposed pairing mechanism via two-particle hybridization can lead to $p$-superconducting states with $η$-pairing. $η$-pairing of spinless fermions could explain the phenomenon of high-temperature superconductivity experimentally observed in hydrogen-rich materials at high pressures. |
| title | $η$-pairing in a two-band model of spinless fermions |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2604.21318 |