Observation of excitons bound by antiferromagnetic correlations
Two-dimensional Mott insulators host antiferromagnetic (AFM) correlations that are predicted to enhance the attractive interaction between empty (holons) and doubly occupied (doublons) sites, creating a novel pathway for exciton formation. However, experimental confirmation of this spin-mediated bin...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2025-01-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.7.013114 |
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| _version_ | 1832577732388585472 |
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| author | Omar Mehio Yuchen Han Xinwei Li Honglie Ning Zach Porter Stephen D. Wilson David Hsieh |
| author_facet | Omar Mehio Yuchen Han Xinwei Li Honglie Ning Zach Porter Stephen D. Wilson David Hsieh |
| author_sort | Omar Mehio |
| collection | DOAJ |
| description | Two-dimensional Mott insulators host antiferromagnetic (AFM) correlations that are predicted to enhance the attractive interaction between empty (holons) and doubly occupied (doublons) sites, creating a novel pathway for exciton formation. However, experimental confirmation of this spin-mediated binding mechanism remains elusive. Leveraging the distinct magnetic critical properties of the Mott antiferromagnets Sr_{2}IrO_{4} and Sr_{3}Ir_{2}O_{7}, we show using time-resolved THz spectroscopy that excitons exist only at temperatures below where short-range AFM correlation develops. The excitons remain stable up to photodoping densities approaching the predicted excitonic Mott insulator-to-metal transition, revealing a unique robustness against screening. Our results establish the viability of spin-bound excitons and introduce opportunities for excitonic control through magnetic degrees of freedom. |
| format | Article |
| id | doaj-art-357a373104884c049974c00ae7816850 |
| institution | Kabale University |
| issn | 2643-1564 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj-art-357a373104884c049974c00ae78168502025-01-30T15:10:13ZengAmerican Physical SocietyPhysical Review Research2643-15642025-01-017101311410.1103/PhysRevResearch.7.013114Observation of excitons bound by antiferromagnetic correlationsOmar MehioYuchen HanXinwei LiHonglie NingZach PorterStephen D. WilsonDavid HsiehTwo-dimensional Mott insulators host antiferromagnetic (AFM) correlations that are predicted to enhance the attractive interaction between empty (holons) and doubly occupied (doublons) sites, creating a novel pathway for exciton formation. However, experimental confirmation of this spin-mediated binding mechanism remains elusive. Leveraging the distinct magnetic critical properties of the Mott antiferromagnets Sr_{2}IrO_{4} and Sr_{3}Ir_{2}O_{7}, we show using time-resolved THz spectroscopy that excitons exist only at temperatures below where short-range AFM correlation develops. The excitons remain stable up to photodoping densities approaching the predicted excitonic Mott insulator-to-metal transition, revealing a unique robustness against screening. Our results establish the viability of spin-bound excitons and introduce opportunities for excitonic control through magnetic degrees of freedom.http://doi.org/10.1103/PhysRevResearch.7.013114 |
| spellingShingle | Omar Mehio Yuchen Han Xinwei Li Honglie Ning Zach Porter Stephen D. Wilson David Hsieh Observation of excitons bound by antiferromagnetic correlations Physical Review Research |
| title | Observation of excitons bound by antiferromagnetic correlations |
| title_full | Observation of excitons bound by antiferromagnetic correlations |
| title_fullStr | Observation of excitons bound by antiferromagnetic correlations |
| title_full_unstemmed | Observation of excitons bound by antiferromagnetic correlations |
| title_short | Observation of excitons bound by antiferromagnetic correlations |
| title_sort | observation of excitons bound by antiferromagnetic correlations |
| url | http://doi.org/10.1103/PhysRevResearch.7.013114 |
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