Excitonic insulator candidate Ta2NiSe5 and related transition-metal compounds studied by resonant inelastic x-ray scattering
Resonant inelastic x-ray scattering (RIXS) can probe electron-hole excitations in excitonic insulators (EIs) which are realized by Coulomb attractive interaction between electrons and holes in semimetals or narrow gap semiconductors. In the present article, we review the exotic electronic state of a...
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Frontiers Media S.A.
2025-02-01
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| Series: | Frontiers in Electronic Materials |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/femat.2025.1456147/full |
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| author | Takashi Mizokawa Claude Monney |
| author_facet | Takashi Mizokawa Claude Monney |
| author_sort | Takashi Mizokawa |
| collection | DOAJ |
| description | Resonant inelastic x-ray scattering (RIXS) can probe electron-hole excitations in excitonic insulators (EIs) which are realized by Coulomb attractive interaction between electrons and holes in semimetals or narrow gap semiconductors. In the present article, we review the exotic electronic state of an EI candidate Ta2NiSe5 which is probed by Ni 2p-3d RIXS as well as Ni 2p x-ray photoemission/absorption spectroscopy. The RIXS results on the exotic electronic state under the electron-hole and electron-lattice correlations suggest requirement of a new theoretical scheme which can describe itinerant electron-hole excitations and the localized charge-transfer excitations as well as the electron-lattice interaction. |
| format | Article |
| id | doaj-art-a1af2761b9fd4f0b9383ae6ee323551a |
| institution | Kabale University |
| issn | 2673-9895 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Electronic Materials |
| spelling | doaj-art-a1af2761b9fd4f0b9383ae6ee323551a2025-02-06T07:09:55ZengFrontiers Media S.A.Frontiers in Electronic Materials2673-98952025-02-01510.3389/femat.2025.14561471456147Excitonic insulator candidate Ta2NiSe5 and related transition-metal compounds studied by resonant inelastic x-ray scatteringTakashi Mizokawa0Claude Monney1Department of Applied Physics, Waseda University, Tokyo, JapanDépartement de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, Fribourg, SwitzerlandResonant inelastic x-ray scattering (RIXS) can probe electron-hole excitations in excitonic insulators (EIs) which are realized by Coulomb attractive interaction between electrons and holes in semimetals or narrow gap semiconductors. In the present article, we review the exotic electronic state of an EI candidate Ta2NiSe5 which is probed by Ni 2p-3d RIXS as well as Ni 2p x-ray photoemission/absorption spectroscopy. The RIXS results on the exotic electronic state under the electron-hole and electron-lattice correlations suggest requirement of a new theoretical scheme which can describe itinerant electron-hole excitations and the localized charge-transfer excitations as well as the electron-lattice interaction.https://www.frontiersin.org/articles/10.3389/femat.2025.1456147/fullresonant inelastic x-ray scattering (RIXS)excitonic insulator candidatetransition-metal chalcogenidesnegative charge-transfer energyelectron-hole excitations |
| spellingShingle | Takashi Mizokawa Claude Monney Excitonic insulator candidate Ta2NiSe5 and related transition-metal compounds studied by resonant inelastic x-ray scattering Frontiers in Electronic Materials resonant inelastic x-ray scattering (RIXS) excitonic insulator candidate transition-metal chalcogenides negative charge-transfer energy electron-hole excitations |
| title | Excitonic insulator candidate Ta2NiSe5 and related transition-metal compounds studied by resonant inelastic x-ray scattering |
| title_full | Excitonic insulator candidate Ta2NiSe5 and related transition-metal compounds studied by resonant inelastic x-ray scattering |
| title_fullStr | Excitonic insulator candidate Ta2NiSe5 and related transition-metal compounds studied by resonant inelastic x-ray scattering |
| title_full_unstemmed | Excitonic insulator candidate Ta2NiSe5 and related transition-metal compounds studied by resonant inelastic x-ray scattering |
| title_short | Excitonic insulator candidate Ta2NiSe5 and related transition-metal compounds studied by resonant inelastic x-ray scattering |
| title_sort | excitonic insulator candidate ta2nise5 and related transition metal compounds studied by resonant inelastic x ray scattering |
| topic | resonant inelastic x-ray scattering (RIXS) excitonic insulator candidate transition-metal chalcogenides negative charge-transfer energy electron-hole excitations |
| url | https://www.frontiersin.org/articles/10.3389/femat.2025.1456147/full |
| work_keys_str_mv | AT takashimizokawa excitonicinsulatorcandidateta2nise5andrelatedtransitionmetalcompoundsstudiedbyresonantinelasticxrayscattering AT claudemonney excitonicinsulatorcandidateta2nise5andrelatedtransitionmetalcompoundsstudiedbyresonantinelasticxrayscattering |