Theoretical studies of magneto-optical Kerr and Faraday effects in two-dimensional second-order topological insulators
Abstract Optical approaches are useful for studying the electronic and spin structure of materials. Here, based on the tight-binding model and linear response theory, we investigate the magneto-optical Kerr and Faraday effects in two-dimensional second-order topological insulators (SOTI) with extern...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2023-08-01
|
| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-023-39644-y |
| _version_ | 1827634293608808448 |
|---|---|
| author | Wan-Qing Zhu Wen-Yu Shan |
| author_facet | Wan-Qing Zhu Wen-Yu Shan |
| author_sort | Wan-Qing Zhu |
| collection | DOAJ |
| description | Abstract Optical approaches are useful for studying the electronic and spin structure of materials. Here, based on the tight-binding model and linear response theory, we investigate the magneto-optical Kerr and Faraday effects in two-dimensional second-order topological insulators (SOTI) with external magnetization. We find that orbital-dependent Zeeman term induces band crossings for SOTI phase, which are absent for trivial phase. In the weak-magnetization regime, these crossings give rise to giant jumps (peaks) of Kerr and Faraday angles (ellipticity) for SOTI phase. In the strong-magnetization regime, we find that two nearly flat bands are formed at the high-symmetry point of Brillouin zone of SOTI phase. These flat bands give rise to two successive giant jumps (peaks) of Kerr and Faraday angles (ellipticity). These phenomena provide new possibilities to characterize and detect the two-dimensional SOTI phase. |
| first_indexed | 2024-03-09T15:11:21Z |
| format | Article |
| id | doaj.art-0228144d3d1f45d59b992086a1dc64ca |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-03-09T15:11:21Z |
| publishDate | 2023-08-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-0228144d3d1f45d59b992086a1dc64ca2023-11-26T13:19:35ZengNature PortfolioScientific Reports2045-23222023-08-0113111210.1038/s41598-023-39644-yTheoretical studies of magneto-optical Kerr and Faraday effects in two-dimensional second-order topological insulatorsWan-Qing Zhu0Wen-Yu Shan1Department of Physics, School of Physics and Materials Science, Guangzhou UniversityDepartment of Physics, School of Physics and Materials Science, Guangzhou UniversityAbstract Optical approaches are useful for studying the electronic and spin structure of materials. Here, based on the tight-binding model and linear response theory, we investigate the magneto-optical Kerr and Faraday effects in two-dimensional second-order topological insulators (SOTI) with external magnetization. We find that orbital-dependent Zeeman term induces band crossings for SOTI phase, which are absent for trivial phase. In the weak-magnetization regime, these crossings give rise to giant jumps (peaks) of Kerr and Faraday angles (ellipticity) for SOTI phase. In the strong-magnetization regime, we find that two nearly flat bands are formed at the high-symmetry point of Brillouin zone of SOTI phase. These flat bands give rise to two successive giant jumps (peaks) of Kerr and Faraday angles (ellipticity). These phenomena provide new possibilities to characterize and detect the two-dimensional SOTI phase.https://doi.org/10.1038/s41598-023-39644-y |
| spellingShingle | Wan-Qing Zhu Wen-Yu Shan Theoretical studies of magneto-optical Kerr and Faraday effects in two-dimensional second-order topological insulators Scientific Reports |
| title | Theoretical studies of magneto-optical Kerr and Faraday effects in two-dimensional second-order topological insulators |
| title_full | Theoretical studies of magneto-optical Kerr and Faraday effects in two-dimensional second-order topological insulators |
| title_fullStr | Theoretical studies of magneto-optical Kerr and Faraday effects in two-dimensional second-order topological insulators |
| title_full_unstemmed | Theoretical studies of magneto-optical Kerr and Faraday effects in two-dimensional second-order topological insulators |
| title_short | Theoretical studies of magneto-optical Kerr and Faraday effects in two-dimensional second-order topological insulators |
| title_sort | theoretical studies of magneto optical kerr and faraday effects in two dimensional second order topological insulators |
| url | https://doi.org/10.1038/s41598-023-39644-y |
| work_keys_str_mv | AT wanqingzhu theoreticalstudiesofmagnetoopticalkerrandfaradayeffectsintwodimensionalsecondordertopologicalinsulators AT wenyushan theoreticalstudiesofmagnetoopticalkerrandfaradayeffectsintwodimensionalsecondordertopologicalinsulators |