Magneto-optical effects of an artificially-layered ferromagnetic topological insulator with T$_C$ of 160 K
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866913490919227392 |
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| author | Han, Xingyue Yi, Hee Taek Oh, Seongshik Wu, Liang |
| author_facet | Han, Xingyue Yi, Hee Taek Oh, Seongshik Wu, Liang |
| contents | Magnetic topological insulator is a fertile platform to study the interplay between magnetism and topology. The unique electronic band structure can induce exotic transport and optical properties. However, a comprehensive optical study in both near-infrared frequency and terahertz frequency has been lacking. Here, we report magneto-optical effects from a heterostructure of Cr-incorporated topological insulator, CBST. We use 800 nm magneto-optical Kerr effect to reveal a ferromagnetic order in the CBST film with a high transition temperature at 160 K. We also use time-domain terahertz polarimetry to reveal a terahertz Faraday rotation of 1.5 mrad and Kerr rotation of 5.1 mrad at 2 K. The calculated terahertz Hall conductance is 0.42 $e^2/h$. Our work shows the optical responses of an artificially layered magnetic topological insulator, paving the way towards high-temperature quantum anomalous Hall effect via heterostructure engineering. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_08687 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Magneto-optical effects of an artificially-layered ferromagnetic topological insulator with T$_C$ of 160 K Han, Xingyue Yi, Hee Taek Oh, Seongshik Wu, Liang Materials Science Magnetic topological insulator is a fertile platform to study the interplay between magnetism and topology. The unique electronic band structure can induce exotic transport and optical properties. However, a comprehensive optical study in both near-infrared frequency and terahertz frequency has been lacking. Here, we report magneto-optical effects from a heterostructure of Cr-incorporated topological insulator, CBST. We use 800 nm magneto-optical Kerr effect to reveal a ferromagnetic order in the CBST film with a high transition temperature at 160 K. We also use time-domain terahertz polarimetry to reveal a terahertz Faraday rotation of 1.5 mrad and Kerr rotation of 5.1 mrad at 2 K. The calculated terahertz Hall conductance is 0.42 $e^2/h$. Our work shows the optical responses of an artificially layered magnetic topological insulator, paving the way towards high-temperature quantum anomalous Hall effect via heterostructure engineering. |
| title | Magneto-optical effects of an artificially-layered ferromagnetic topological insulator with T$_C$ of 160 K |
| topic | Materials Science |
| url | https://arxiv.org/abs/2312.08687 |