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| Autori principali: | , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2026
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| Accesso online: | https://arxiv.org/abs/2605.30293 |
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| _version_ | 1866914614600531968 |
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| author | Xu, Ke-Jun Hsu, Kuan H. Giles-Donovan, Nathan Parzyck, Christopher T. Lee, Gi-Hyeok Yang, Wanli Okamoto, Jun Huang, Hsiao-Yu Huang, Di-Jing Kas, Joshua J. Vinson, John Shen, Zhi-Xun Lee, Dung-Hai Devereaux, Thomas P. Lee, Wei-Sheng Birgeneau, Robert J. |
| author_facet | Xu, Ke-Jun Hsu, Kuan H. Giles-Donovan, Nathan Parzyck, Christopher T. Lee, Gi-Hyeok Yang, Wanli Okamoto, Jun Huang, Hsiao-Yu Huang, Di-Jing Kas, Joshua J. Vinson, John Shen, Zhi-Xun Lee, Dung-Hai Devereaux, Thomas P. Lee, Wei-Sheng Birgeneau, Robert J. |
| contents | A Kondo insulator (KI) is a prototypical example of a highly entangled phase of matter, where many-body interactions between local moments and delocalized electrons engender the non-magnetic insulating ground state. Conventionally, the local moments arise from atomic multiplet states with a narrow bandwidth, limiting Kondo coherence to low temperatures. Here, we realize a new paradigm for constructing the KI state with hybridized molecular orbitals in FeSb2. Resonant inelastic X-ray scattering (RIXS) at the Fe L-edge reveals distinct signatures of band-like continuum states and localized states. Comparisons with first-principles calculations establish a mixed-configuration ground state with hybridized Fe d-Sb p molecular orbitals as basis states. By systematically investigating the RIXS momentum, temperature, and doping dependences, we find propagating collective modes commensurate with many-body charge and spin excitations. Our results pave the way for understanding the emerging class of unconventional d electron insulators and engineering high temperature Kondo many-body states. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_30293 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Spectroscopic evidence for a molecular orbital Kondo insulator Xu, Ke-Jun Hsu, Kuan H. Giles-Donovan, Nathan Parzyck, Christopher T. Lee, Gi-Hyeok Yang, Wanli Okamoto, Jun Huang, Hsiao-Yu Huang, Di-Jing Kas, Joshua J. Vinson, John Shen, Zhi-Xun Lee, Dung-Hai Devereaux, Thomas P. Lee, Wei-Sheng Birgeneau, Robert J. Strongly Correlated Electrons Materials Science A Kondo insulator (KI) is a prototypical example of a highly entangled phase of matter, where many-body interactions between local moments and delocalized electrons engender the non-magnetic insulating ground state. Conventionally, the local moments arise from atomic multiplet states with a narrow bandwidth, limiting Kondo coherence to low temperatures. Here, we realize a new paradigm for constructing the KI state with hybridized molecular orbitals in FeSb2. Resonant inelastic X-ray scattering (RIXS) at the Fe L-edge reveals distinct signatures of band-like continuum states and localized states. Comparisons with first-principles calculations establish a mixed-configuration ground state with hybridized Fe d-Sb p molecular orbitals as basis states. By systematically investigating the RIXS momentum, temperature, and doping dependences, we find propagating collective modes commensurate with many-body charge and spin excitations. Our results pave the way for understanding the emerging class of unconventional d electron insulators and engineering high temperature Kondo many-body states. |
| title | Spectroscopic evidence for a molecular orbital Kondo insulator |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2605.30293 |