Layer Control of Magneto-Optical Effects and Their Quantization in Spin-Valley Splitting Antiferromagnets
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866910381862027264 |
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| author | Feng, Jiaqi Zhou, Xiaodong Xu, Meiling Shi, Jingming Li, Yinwei |
| author_facet | Feng, Jiaqi Zhou, Xiaodong Xu, Meiling Shi, Jingming Li, Yinwei |
| contents | Magneto-optical effects (MOE), interfacing the fundamental interplay between magnetism and light, have served as a powerful probe for magnetic order, band topology, and valley index. Here, based on multiferroic and topological bilayer antiferromagnets (AFMs), we propose a layer control of MOE (L-MOE), which is created and annihilated by layer-stacking or an electric field effect. The key character of L-MOE is the sign-reversible response controlled by ferroelectric polarization, the Neel vector, or the electric field direction. Moreover, the sign-reversible L-MOE can be quantized in topologically insulating AFMs. We reveal that the switchable L-MOE originates from the combined contributions of spin-conserving and spin-flip interband transitions in spin-valley splitting AFMs, a phenomenon not observed in conventional AFMs. Our findings bridge the ancient MOE to the emergent realms of layertronics, valleytronics, and multiferroics and may hold immense potential in these fields. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_16701 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Layer Control of Magneto-Optical Effects and Their Quantization in Spin-Valley Splitting Antiferromagnets Feng, Jiaqi Zhou, Xiaodong Xu, Meiling Shi, Jingming Li, Yinwei Mesoscale and Nanoscale Physics Magneto-optical effects (MOE), interfacing the fundamental interplay between magnetism and light, have served as a powerful probe for magnetic order, band topology, and valley index. Here, based on multiferroic and topological bilayer antiferromagnets (AFMs), we propose a layer control of MOE (L-MOE), which is created and annihilated by layer-stacking or an electric field effect. The key character of L-MOE is the sign-reversible response controlled by ferroelectric polarization, the Neel vector, or the electric field direction. Moreover, the sign-reversible L-MOE can be quantized in topologically insulating AFMs. We reveal that the switchable L-MOE originates from the combined contributions of spin-conserving and spin-flip interband transitions in spin-valley splitting AFMs, a phenomenon not observed in conventional AFMs. Our findings bridge the ancient MOE to the emergent realms of layertronics, valleytronics, and multiferroics and may hold immense potential in these fields. |
| title | Layer Control of Magneto-Optical Effects and Their Quantization in Spin-Valley Splitting Antiferromagnets |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2403.16701 |