Magnetic-field switching of exciton-magnon coupling in LiNiPO$_4$
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866914457495535616 |
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| author | Sun, Bei Yang, Zhuo Shibuya, Julian Kindo, Koichi Kimura, Kenta Miyata, Atsuhiko |
| author_facet | Sun, Bei Yang, Zhuo Shibuya, Julian Kindo, Koichi Kimura, Kenta Miyata, Atsuhiko |
| contents | Exciton-magnon transitions provide a fundamental optical fingerprint of coupled excitonic and magnetic excitations in antiferromagnets. However, controlling such coupled excitations by external fields remains a key challenge. Here we report the temperature and magnetic-field evolution of exciton-magnon coupling in the magnetoelectric antiferromagnet LiNiPO$_4$ using pulsed magnetic fields up to 50 T. The magnon sideband intensity exhibits sharp switching across field-induced magnetic phases, with strong suppression in plateau phases and enhancement in canted spin states. This behavior is attributed to the interplay between the thermal magnon population and the spin-dependent optical transition matrix element. These results demonstrate that magnetic-field control of spin degrees of freedom enables selective switching of exciton-magnon coupling in antiferromagnets. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_06785 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Magnetic-field switching of exciton-magnon coupling in LiNiPO$_4$ Sun, Bei Yang, Zhuo Shibuya, Julian Kindo, Koichi Kimura, Kenta Miyata, Atsuhiko Strongly Correlated Electrons Exciton-magnon transitions provide a fundamental optical fingerprint of coupled excitonic and magnetic excitations in antiferromagnets. However, controlling such coupled excitations by external fields remains a key challenge. Here we report the temperature and magnetic-field evolution of exciton-magnon coupling in the magnetoelectric antiferromagnet LiNiPO$_4$ using pulsed magnetic fields up to 50 T. The magnon sideband intensity exhibits sharp switching across field-induced magnetic phases, with strong suppression in plateau phases and enhancement in canted spin states. This behavior is attributed to the interplay between the thermal magnon population and the spin-dependent optical transition matrix element. These results demonstrate that magnetic-field control of spin degrees of freedom enables selective switching of exciton-magnon coupling in antiferromagnets. |
| title | Magnetic-field switching of exciton-magnon coupling in LiNiPO$_4$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2604.06785 |