Topological surface magnon-polariton in an insulating canted antiferromagnet
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arXiv
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| Autores principales: | , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866911233539571712 |
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| author | Li, Weixin Yuan, Rundong Zhong, Fenglin Peng, Bo Ansermet, Jean-Philippe Yu, Haiming |
| author_facet | Li, Weixin Yuan, Rundong Zhong, Fenglin Peng, Bo Ansermet, Jean-Philippe Yu, Haiming |
| contents | Excitation and control of antiferromagnetic magnon modes lie at the heart of coherent antiferromagnetic spintronics. Here, we propose a topological surface magnon-polariton as a new approach in the prototypical magnonic material hematite. We show that in an insulating canted antiferromagnet, where strong-coupled magnon-photon modes can be achieved using electrical on-chip layouts, a surface magnon-polariton mode exists in the gap of the bulk magnon-photon bands. The emergence of surface magnon-polariton mode is further attributed to the nontrivial topology of bulk magnon-photon bands. Magnon-photon coupling enhances the Berry curvature near the anticrossing points, leading to a topological bulk Chern band associated with the surface magnon-polaritons. Our work provides a general principle for the utilization of optomagnetic properties in antiferromagnets, with an illustration of its experimental feasibility and wide generality as manifested in hematite. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_08334 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Topological surface magnon-polariton in an insulating canted antiferromagnet Li, Weixin Yuan, Rundong Zhong, Fenglin Peng, Bo Ansermet, Jean-Philippe Yu, Haiming Mesoscale and Nanoscale Physics Materials Science Optics Excitation and control of antiferromagnetic magnon modes lie at the heart of coherent antiferromagnetic spintronics. Here, we propose a topological surface magnon-polariton as a new approach in the prototypical magnonic material hematite. We show that in an insulating canted antiferromagnet, where strong-coupled magnon-photon modes can be achieved using electrical on-chip layouts, a surface magnon-polariton mode exists in the gap of the bulk magnon-photon bands. The emergence of surface magnon-polariton mode is further attributed to the nontrivial topology of bulk magnon-photon bands. Magnon-photon coupling enhances the Berry curvature near the anticrossing points, leading to a topological bulk Chern band associated with the surface magnon-polaritons. Our work provides a general principle for the utilization of optomagnetic properties in antiferromagnets, with an illustration of its experimental feasibility and wide generality as manifested in hematite. |
| title | Topological surface magnon-polariton in an insulating canted antiferromagnet |
| topic | Mesoscale and Nanoscale Physics Materials Science Optics |
| url | https://arxiv.org/abs/2510.08334 |