Kerr, Faraday, and Magnetoelectric Effects in MnBi$_2$Te$_4$ Thin Films
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arXiv
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| Hauptverfasser: | , |
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| Format: | Preprint |
| Veröffentlicht: |
2023
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| _version_ | 1866916316840984576 |
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| author | Lei, Chao MacDonald, Allan H. |
| author_facet | Lei, Chao MacDonald, Allan H. |
| contents | The topological magneto-electric effect (TME) is a characteristic property of topological insulators. In this article, we use a simplified coupled-Dirac-cone electronic structure model to theoretically evaluate the THz and far infrared Kerr and Faraday responses of thin films of MnBi$_2$Te$_4$ with up to $N=10$ septuple layers with the goal of clarifying the relationship between these convenient magneto-optical observables and the TME. We find that for even $N$ the linear Kerr and Faraday responses to an electric field vanish in the low-frequency limit, even though the magnetoelectric response is large and approximately quantized. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2303_14635 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Kerr, Faraday, and Magnetoelectric Effects in MnBi$_2$Te$_4$ Thin Films Lei, Chao MacDonald, Allan H. Mesoscale and Nanoscale Physics Materials Science The topological magneto-electric effect (TME) is a characteristic property of topological insulators. In this article, we use a simplified coupled-Dirac-cone electronic structure model to theoretically evaluate the THz and far infrared Kerr and Faraday responses of thin films of MnBi$_2$Te$_4$ with up to $N=10$ septuple layers with the goal of clarifying the relationship between these convenient magneto-optical observables and the TME. We find that for even $N$ the linear Kerr and Faraday responses to an electric field vanish in the low-frequency limit, even though the magnetoelectric response is large and approximately quantized. |
| title | Kerr, Faraday, and Magnetoelectric Effects in MnBi$_2$Te$_4$ Thin Films |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2303.14635 |