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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2602.13924 |
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| _version_ | 1866908835265904640 |
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| author | Wang, Lichen Hameed, Sajna Liu, Yiran Knauft, Manuel Higuchi, Kazuki Krautloher, Maximilian Francoual, Sonia Khaliullin, Giniyat Liu, Huimei Minola, Matteo Keimer, Bernhard |
| author_facet | Wang, Lichen Hameed, Sajna Liu, Yiran Knauft, Manuel Higuchi, Kazuki Krautloher, Maximilian Francoual, Sonia Khaliullin, Giniyat Liu, Huimei Minola, Matteo Keimer, Bernhard |
| contents | Antiferromagnets typically host spin-wave (magnon) excitations in the terahertz (THz) regime, offering a promising platform for high-speed magnonic information technologies. Harnessing these excitations requires sensitive control of their spectral properties. Here we use resonant x-ray diffraction and Raman scattering to demonstrate uniaxial-strain control of the antiferromagnetic (AFM) ground state and THz magnon excitations in the layered Mott insulator Ca$_2$RuO$_4$. Although the states separated by the strain-induced phase transition differ only by the sign of the weak and partially frustrated interlayer interaction, their magnon energies differ by more than 10% (~ 0.3 THz). Our theoretical analysis explains this surprising observation by tracing the origin of both the sign reversal of the interlayer coupling and the magnon energy to the spin-orbital composition of the Ru valence electrons. The extreme strain sensitivity of the THz magnon energy near a magnetic phase transition opens up pathways towards a new generation of transition-edge magnonic devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_13924 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Ultrasensitive strain modulation of terahertz magnons at a magnetic phase transition Wang, Lichen Hameed, Sajna Liu, Yiran Knauft, Manuel Higuchi, Kazuki Krautloher, Maximilian Francoual, Sonia Khaliullin, Giniyat Liu, Huimei Minola, Matteo Keimer, Bernhard Materials Science Antiferromagnets typically host spin-wave (magnon) excitations in the terahertz (THz) regime, offering a promising platform for high-speed magnonic information technologies. Harnessing these excitations requires sensitive control of their spectral properties. Here we use resonant x-ray diffraction and Raman scattering to demonstrate uniaxial-strain control of the antiferromagnetic (AFM) ground state and THz magnon excitations in the layered Mott insulator Ca$_2$RuO$_4$. Although the states separated by the strain-induced phase transition differ only by the sign of the weak and partially frustrated interlayer interaction, their magnon energies differ by more than 10% (~ 0.3 THz). Our theoretical analysis explains this surprising observation by tracing the origin of both the sign reversal of the interlayer coupling and the magnon energy to the spin-orbital composition of the Ru valence electrons. The extreme strain sensitivity of the THz magnon energy near a magnetic phase transition opens up pathways towards a new generation of transition-edge magnonic devices. |
| title | Ultrasensitive strain modulation of terahertz magnons at a magnetic phase transition |
| topic | Materials Science |
| url | https://arxiv.org/abs/2602.13924 |