Orbital-specific Itinerancy and Localization in a Kagome Magnet
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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_ | 1866914413595852800 |
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| author | Streltsov, S. V. Huang, H. Y. Ushakov, A. Wu, C. I. Singh, A. Su, J. Okamoto, J. Chen, C. T. Wang, K. Poteryaev, A. I. Cheong, S-W. Fujimori, A. Huang, D. J. |
| author_facet | Streltsov, S. V. Huang, H. Y. Ushakov, A. Wu, C. I. Singh, A. Su, J. Okamoto, J. Chen, C. T. Wang, K. Poteryaev, A. I. Cheong, S-W. Fujimori, A. Huang, D. J. |
| contents | The kagome lattice naturally hosts flat bands, Dirac fermions, and van Hove singularities, yet whether its geometry can stabilize orbital-selective phases - a hallmark of Hund's physics in multi-orbital correlated systems - has remained an open question. Here, we combine resonant inelastic X-ray scattering with density functional theory and dynamical mean-field theory to demonstrate that YMn$_6$Sn$_6$ exhibits a spontaneous orbital differentiation into coexisting itinerant and localized electrons within the same Mn $3d$ manifold. Orbitals directed along Mn-Mn bonds provide coherent quasiparticles and metallic bands, while those pointing toward ligands become strongly correlated and display non-Fermi-liquid behavior. Hund's intra-atomic exchange suppresses orbital fluctuations, stabilizing this dichotomy and providing a natural double-exchange-like mechanism for the observed ferromagnetic bilayer coupling. Our work establishes YMn$_6$Sn$_6$ as a kagome platform where orbital selectivity, flat-band topology, and Hund's metallicity converge - revealing that geometric frustration and correlation-driven orbital differentiation can cooperatively design exotic quantum phases beyond the canonical paradigms of Mott physics or band topology alone. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2603_21203 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Orbital-specific Itinerancy and Localization in a Kagome Magnet Streltsov, S. V. Huang, H. Y. Ushakov, A. Wu, C. I. Singh, A. Su, J. Okamoto, J. Chen, C. T. Wang, K. Poteryaev, A. I. Cheong, S-W. Fujimori, A. Huang, D. J. Strongly Correlated Electrons Materials Science The kagome lattice naturally hosts flat bands, Dirac fermions, and van Hove singularities, yet whether its geometry can stabilize orbital-selective phases - a hallmark of Hund's physics in multi-orbital correlated systems - has remained an open question. Here, we combine resonant inelastic X-ray scattering with density functional theory and dynamical mean-field theory to demonstrate that YMn$_6$Sn$_6$ exhibits a spontaneous orbital differentiation into coexisting itinerant and localized electrons within the same Mn $3d$ manifold. Orbitals directed along Mn-Mn bonds provide coherent quasiparticles and metallic bands, while those pointing toward ligands become strongly correlated and display non-Fermi-liquid behavior. Hund's intra-atomic exchange suppresses orbital fluctuations, stabilizing this dichotomy and providing a natural double-exchange-like mechanism for the observed ferromagnetic bilayer coupling. Our work establishes YMn$_6$Sn$_6$ as a kagome platform where orbital selectivity, flat-band topology, and Hund's metallicity converge - revealing that geometric frustration and correlation-driven orbital differentiation can cooperatively design exotic quantum phases beyond the canonical paradigms of Mott physics or band topology alone. |
| title | Orbital-specific Itinerancy and Localization in a Kagome Magnet |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2603.21203 |