Giant X-ray circular dichroism in a time-reversal invariant altermagnet
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arXiv
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| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866916527451668480 |
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| author | Okamoto, Jun Wang, Ru-Pan Chu, Yen-Yi Shiu, Hung-Wei Singh, Amol Huang, Hsiao-Yu Mou, Chung-Yu Teh, Sucitto Jeng, Horng-Tay Du, Kai Xu, Xianghan Cheong, Sang-Wook Du, Chao-Hung Chen, Chien-Te Fujimori, Atsushi Huang, Di-Jing |
| author_facet | Okamoto, Jun Wang, Ru-Pan Chu, Yen-Yi Shiu, Hung-Wei Singh, Amol Huang, Hsiao-Yu Mou, Chung-Yu Teh, Sucitto Jeng, Horng-Tay Du, Kai Xu, Xianghan Cheong, Sang-Wook Du, Chao-Hung Chen, Chien-Te Fujimori, Atsushi Huang, Di-Jing |
| contents | X-ray circular dichroism, arising from the contrast in X-ray absorption between opposite photon helicities, serves as a spectroscopic tool to measure the magnetization of ferromagnetic materials and identify the handedness of chiral crystals. Antiferromagnets with crystallographic chirality typically lack X-ray magnetic circular dichroism because of time-reversal symmetry, yet exhibit weak X-ray natural circular dichroism. Here, we report the observation of giant natural circular dichroism in the Ni $L_3$-edge X-ray absorption of Ni$_3$TeO$_6$, a polar and chiral antiferromagnet with effective time-reversal symmetry. To unravel this intriguing phenomenon, we propose a phenomenological model that classifies the movement of photons in a chiral crystal within the same symmetry class as that of a magnetic field. The coupling of X-ray polarization with the induced magnetization yields giant X-ray natural circular dichroism, revealing the altermagnetism of Ni$_3$TeO$_6$. Our findings provide evidence for the interplay between magnetism and crystal chirality in natural optical activity. Additionally, we establish the first example of a new class of magnetic materials exhibiting circular dichroism with time-reversal symmetry. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_07081 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Giant X-ray circular dichroism in a time-reversal invariant altermagnet Okamoto, Jun Wang, Ru-Pan Chu, Yen-Yi Shiu, Hung-Wei Singh, Amol Huang, Hsiao-Yu Mou, Chung-Yu Teh, Sucitto Jeng, Horng-Tay Du, Kai Xu, Xianghan Cheong, Sang-Wook Du, Chao-Hung Chen, Chien-Te Fujimori, Atsushi Huang, Di-Jing Strongly Correlated Electrons Materials Science X-ray circular dichroism, arising from the contrast in X-ray absorption between opposite photon helicities, serves as a spectroscopic tool to measure the magnetization of ferromagnetic materials and identify the handedness of chiral crystals. Antiferromagnets with crystallographic chirality typically lack X-ray magnetic circular dichroism because of time-reversal symmetry, yet exhibit weak X-ray natural circular dichroism. Here, we report the observation of giant natural circular dichroism in the Ni $L_3$-edge X-ray absorption of Ni$_3$TeO$_6$, a polar and chiral antiferromagnet with effective time-reversal symmetry. To unravel this intriguing phenomenon, we propose a phenomenological model that classifies the movement of photons in a chiral crystal within the same symmetry class as that of a magnetic field. The coupling of X-ray polarization with the induced magnetization yields giant X-ray natural circular dichroism, revealing the altermagnetism of Ni$_3$TeO$_6$. Our findings provide evidence for the interplay between magnetism and crystal chirality in natural optical activity. Additionally, we establish the first example of a new class of magnetic materials exhibiting circular dichroism with time-reversal symmetry. |
| title | Giant X-ray circular dichroism in a time-reversal invariant altermagnet |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2312.07081 |