Distinct Optical Excitation Mechanisms of a Coherent Magnon in a van der Waals Antiferromagnet
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866917919406948352 |
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| author | Allington, Clifford J. Belvin, Carina A. Seifert, Urban F. P. Ye, Mengxing Tai, Tommy Baldini, Edoardo Son, Suhan Kim, Junghyun Park, Jaena Park, Je-Geun Balents, Leon Gedik, Nuh |
| author_facet | Allington, Clifford J. Belvin, Carina A. Seifert, Urban F. P. Ye, Mengxing Tai, Tommy Baldini, Edoardo Son, Suhan Kim, Junghyun Park, Jaena Park, Je-Geun Balents, Leon Gedik, Nuh |
| contents | The control of antiferromagnets with ultrashort optical pulses has emerged as a prominent field of research. Tailored laser excitation can launch coherent spin waves at terahertz frequencies, yet a comprehensive description of their generation mechanisms is still lacking despite extensive efforts. Using terahertz emission spectroscopy, we investigate the generation of a coherent magnon mode in the van der Waals antiferromagnet NiPS$_3$ under a range of photoexcitation conditions. By tuning the pump photon energy from transparency to resonant with a $d$-$d$ transition, we reveal a striking change in the coherent magnon's dependence on the pump polarization, indicating two distinct excitation mechanisms. Our findings provide a strategy for the manipulation of magnetic modes via photoexcitation around sub-gap electronic states. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_17041 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Distinct Optical Excitation Mechanisms of a Coherent Magnon in a van der Waals Antiferromagnet Allington, Clifford J. Belvin, Carina A. Seifert, Urban F. P. Ye, Mengxing Tai, Tommy Baldini, Edoardo Son, Suhan Kim, Junghyun Park, Jaena Park, Je-Geun Balents, Leon Gedik, Nuh Strongly Correlated Electrons The control of antiferromagnets with ultrashort optical pulses has emerged as a prominent field of research. Tailored laser excitation can launch coherent spin waves at terahertz frequencies, yet a comprehensive description of their generation mechanisms is still lacking despite extensive efforts. Using terahertz emission spectroscopy, we investigate the generation of a coherent magnon mode in the van der Waals antiferromagnet NiPS$_3$ under a range of photoexcitation conditions. By tuning the pump photon energy from transparency to resonant with a $d$-$d$ transition, we reveal a striking change in the coherent magnon's dependence on the pump polarization, indicating two distinct excitation mechanisms. Our findings provide a strategy for the manipulation of magnetic modes via photoexcitation around sub-gap electronic states. |
| title | Distinct Optical Excitation Mechanisms of a Coherent Magnon in a van der Waals Antiferromagnet |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2402.17041 |