Co-operating multiorbital and nonlocal correlations in bilayer nickelate
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866915927345332224 |
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| author | Stepanov, Evgeny A. Bötzel, Steffen Eremin, Ilya M. Lechermann, Frank |
| author_facet | Stepanov, Evgeny A. Bötzel, Steffen Eremin, Ilya M. Lechermann, Frank |
| contents | The interplay of multiorbital physics and nonlocal self-energy effects is studied within an effective three-orbital model for the high-pressure normal state of superconducting bilayer nickelate La$_3$Ni$_2$O$_7$. The model is solved within an advanced many-body framework capturing $k$-dependent correlations beyond dynamical mean-field theory. Different low-energy scenarios subtly depend on the strength of the interorbital interaction, either placing the notorious flat $γ$ quasiparticle band in the occupied part of the spectrum, or letting it cross the Fermi level. In the latter case, intriguing spin-polaron formation due to the scattering of electrons with paramagnon excitations takes place. This leads to bound states appearing as a shadow band with incoherent low-energy spectral weight below the Fermi level. Our results uncover additional competing states that exist in bilayer nickelates and could explain the controversy of recent angle-resolved photoemission experiments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_08221 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Co-operating multiorbital and nonlocal correlations in bilayer nickelate Stepanov, Evgeny A. Bötzel, Steffen Eremin, Ilya M. Lechermann, Frank Strongly Correlated Electrons Materials Science The interplay of multiorbital physics and nonlocal self-energy effects is studied within an effective three-orbital model for the high-pressure normal state of superconducting bilayer nickelate La$_3$Ni$_2$O$_7$. The model is solved within an advanced many-body framework capturing $k$-dependent correlations beyond dynamical mean-field theory. Different low-energy scenarios subtly depend on the strength of the interorbital interaction, either placing the notorious flat $γ$ quasiparticle band in the occupied part of the spectrum, or letting it cross the Fermi level. In the latter case, intriguing spin-polaron formation due to the scattering of electrons with paramagnon excitations takes place. This leads to bound states appearing as a shadow band with incoherent low-energy spectral weight below the Fermi level. Our results uncover additional competing states that exist in bilayer nickelates and could explain the controversy of recent angle-resolved photoemission experiments. |
| title | Co-operating multiorbital and nonlocal correlations in bilayer nickelate |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2604.08221 |