Quantum metric induced magneto-optical effects in $\mathcal{PT}$-symmetric antiferromagnets
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arXiv
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| Main Authors: | , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866929744837083136 |
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| author | Li, Yongpan Liu, Yichen Liu, Cheng-Cheng |
| author_facet | Li, Yongpan Liu, Yichen Liu, Cheng-Cheng |
| contents | The magneto-optical effects (MOEs), as a fundamental physical phenomenon, can reveal the electronic structures of materials. The related probing methods are widely used in the study of magnetic materials. However, space-time inversion ($\mathcal{PT}$) symmetric antiferromagnets were previously believed to be magneto-optically inactive. Here, we point out that this traditional understanding is incorrect. Based on our generic formulas and symmetry analysis, we find that in $\mathcal{PT}$-symmetric antiferromagnets, it is the quantum metric, i.e., the real part of the quantum geometry, that induces MOEs. Combining a tight-binding model and first-principles calculations, we confirm this observation by showing MOEs in the $\mathcal{PT}$-symmetric antiferromagnet. Our work demonstrates that $\mathcal{PT}$-symmetric antiferromagnets previously thought to lack MOEs can indeed exhibit MOEs and greatly broaden the research on MOEs. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_04312 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quantum metric induced magneto-optical effects in $\mathcal{PT}$-symmetric antiferromagnets Li, Yongpan Liu, Yichen Liu, Cheng-Cheng Materials Science Mesoscale and Nanoscale Physics Computational Physics The magneto-optical effects (MOEs), as a fundamental physical phenomenon, can reveal the electronic structures of materials. The related probing methods are widely used in the study of magnetic materials. However, space-time inversion ($\mathcal{PT}$) symmetric antiferromagnets were previously believed to be magneto-optically inactive. Here, we point out that this traditional understanding is incorrect. Based on our generic formulas and symmetry analysis, we find that in $\mathcal{PT}$-symmetric antiferromagnets, it is the quantum metric, i.e., the real part of the quantum geometry, that induces MOEs. Combining a tight-binding model and first-principles calculations, we confirm this observation by showing MOEs in the $\mathcal{PT}$-symmetric antiferromagnet. Our work demonstrates that $\mathcal{PT}$-symmetric antiferromagnets previously thought to lack MOEs can indeed exhibit MOEs and greatly broaden the research on MOEs. |
| title | Quantum metric induced magneto-optical effects in $\mathcal{PT}$-symmetric antiferromagnets |
| topic | Materials Science Mesoscale and Nanoscale Physics Computational Physics |
| url | https://arxiv.org/abs/2503.04312 |