Revealing Hund superdispersion with tunneling spectroscopy
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866917502523539456 |
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| author | Rhodes, Luke C. Kugler, Fabian B. Gingras, Olivier Marques, Carolina Morales, Edgar Abarca King, Phil D. C. Georges, Antoine Wahl, Peter |
| author_facet | Rhodes, Luke C. Kugler, Fabian B. Gingras, Olivier Marques, Carolina Morales, Edgar Abarca King, Phil D. C. Georges, Antoine Wahl, Peter |
| contents | In cuprate superconductors, electron-electron repulsion results in characteristic spectroscopic features known as `waterfalls', where the sharp quasiparticle dispersion transitions into broad Hubbard bands. However, in multi-orbital systems, the additional Hund coupling results in behavior that defies the conventional Mott--Hubbard paradigm, creating qualitatively distinct `superdispersive' features in the spectral function. Here, we use tunneling spectroscopy to reveal this signature of Hund physics in Sr$_2$RuO$_4$. By combining density functional theory, dynamical mean-field theory, and continuum local density of states calculations, we show that the experimental features are in excellent agreement with theoretical predictions and intimately linked to the non-monotonous energy dependence of the real part of the self-energy in a Hund metal. Our results provide direct experimental evidence for Hund-induced spectroscopic features and open a new route to probing correlation effects in quantum materials. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_16580 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Revealing Hund superdispersion with tunneling spectroscopy Rhodes, Luke C. Kugler, Fabian B. Gingras, Olivier Marques, Carolina Morales, Edgar Abarca King, Phil D. C. Georges, Antoine Wahl, Peter Strongly Correlated Electrons Materials Science In cuprate superconductors, electron-electron repulsion results in characteristic spectroscopic features known as `waterfalls', where the sharp quasiparticle dispersion transitions into broad Hubbard bands. However, in multi-orbital systems, the additional Hund coupling results in behavior that defies the conventional Mott--Hubbard paradigm, creating qualitatively distinct `superdispersive' features in the spectral function. Here, we use tunneling spectroscopy to reveal this signature of Hund physics in Sr$_2$RuO$_4$. By combining density functional theory, dynamical mean-field theory, and continuum local density of states calculations, we show that the experimental features are in excellent agreement with theoretical predictions and intimately linked to the non-monotonous energy dependence of the real part of the self-energy in a Hund metal. Our results provide direct experimental evidence for Hund-induced spectroscopic features and open a new route to probing correlation effects in quantum materials. |
| title | Revealing Hund superdispersion with tunneling spectroscopy |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2605.16580 |