Spin-to-charge-current conversion in altermagnetic candidate RuO$_2$ probed by terahertz emission spectroscopy
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Jechumtál, J. Gueckstock, O. Jasenský, K. Kašpar, Z. Olejník, K Gaerner, M. Reiss, G. Moser, S. Kessler, P. De Luca, G. Ganguly, S. Santiso, J. Scheffler, D. Zázvorka, J. Kubaščík, P. Reichlova, H. Schmoranzerova, E. Němec, P. Jungwirth, T. Kužel, P. Kampfrath, T. Nádvorník, L. |
| author_facet | Jechumtál, J. Gueckstock, O. Jasenský, K. Kašpar, Z. Olejník, K Gaerner, M. Reiss, G. Moser, S. Kessler, P. De Luca, G. Ganguly, S. Santiso, J. Scheffler, D. Zázvorka, J. Kubaščík, P. Reichlova, H. Schmoranzerova, E. Němec, P. Jungwirth, T. Kužel, P. Kampfrath, T. Nádvorník, L. |
| contents | Using the THz emission spectroscopy, we investigate ultrafast spin-to-charge current conversion in epitaxial thin films of the altermagnetic candidate RuO$_2$. We perform a quantitative analysis of competing effects that can contribute to the measured anisotropic THz emission. These include the anisotropic inverse spin splitter and spin Hall effects in RuO$_2$, the anisotropic conductivity of RuO$_2$, and the birefringence of the TiO$_2$ substrate. We observe that the leading contribution to the measured signals comes from the anisotropic inverse spin Hall effect, with an average spin-Hall angle of $2.4\times 10^{-3}$ at room temperature. In comparison, a possible contribution from the altermagnetic inverse spin-splitter effect is found to be approximately $2-4\times 10^{-4}$. Our work stresses the importance of carefully disentangling spin-dependent phenomena that can be generated by the unconventional altermagnetic order, from the effects of the relativistic spin-orbit coupling. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2508_11481 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Spin-to-charge-current conversion in altermagnetic candidate RuO$_2$ probed by terahertz emission spectroscopy Jechumtál, J. Gueckstock, O. Jasenský, K. Kašpar, Z. Olejník, K Gaerner, M. Reiss, G. Moser, S. Kessler, P. De Luca, G. Ganguly, S. Santiso, J. Scheffler, D. Zázvorka, J. Kubaščík, P. Reichlova, H. Schmoranzerova, E. Němec, P. Jungwirth, T. Kužel, P. Kampfrath, T. Nádvorník, L. Mesoscale and Nanoscale Physics Materials Science Using the THz emission spectroscopy, we investigate ultrafast spin-to-charge current conversion in epitaxial thin films of the altermagnetic candidate RuO$_2$. We perform a quantitative analysis of competing effects that can contribute to the measured anisotropic THz emission. These include the anisotropic inverse spin splitter and spin Hall effects in RuO$_2$, the anisotropic conductivity of RuO$_2$, and the birefringence of the TiO$_2$ substrate. We observe that the leading contribution to the measured signals comes from the anisotropic inverse spin Hall effect, with an average spin-Hall angle of $2.4\times 10^{-3}$ at room temperature. In comparison, a possible contribution from the altermagnetic inverse spin-splitter effect is found to be approximately $2-4\times 10^{-4}$. Our work stresses the importance of carefully disentangling spin-dependent phenomena that can be generated by the unconventional altermagnetic order, from the effects of the relativistic spin-orbit coupling. |
| title | Spin-to-charge-current conversion in altermagnetic candidate RuO$_2$ probed by terahertz emission spectroscopy |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2508.11481 |