Topological kink plasmons on magnetic-domain boundaries
© 2019, The Author(s). Two-dimensional topological materials bearing time reversal-breaking magnetic fields support protected one-way edge modes. Normally, these edge modes adhere to physical edges where material properties change abruptly. However, even in homogeneous materials, topology still perm...
| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Springer Science and Business Media LLC
2021
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| Online Access: | https://hdl.handle.net/1721.1/136472 |
| _version_ | 1811084243444432896 |
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| author | Jin, Dafei Xia, Yang Christensen, Thomas Freeman, Matthew Wang, Siqi Fong, King Yan Gardner, Geoffrey C Fallahi, Saeed Hu, Qing Wang, Yuan Engel, Lloyd Xiao, Zhi-Li Manfra, Michael J Fang, Nicholas X Zhang, Xiang |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Jin, Dafei Xia, Yang Christensen, Thomas Freeman, Matthew Wang, Siqi Fong, King Yan Gardner, Geoffrey C Fallahi, Saeed Hu, Qing Wang, Yuan Engel, Lloyd Xiao, Zhi-Li Manfra, Michael J Fang, Nicholas X Zhang, Xiang |
| author_sort | Jin, Dafei |
| collection | MIT |
| description | © 2019, The Author(s). Two-dimensional topological materials bearing time reversal-breaking magnetic fields support protected one-way edge modes. Normally, these edge modes adhere to physical edges where material properties change abruptly. However, even in homogeneous materials, topology still permits a unique form of edge modes – kink modes – residing at the domain boundaries of magnetic fields within the materials. This scenario, despite being predicted in theory, has rarely been demonstrated experimentally. Here, we report our observation of topologically-protected high-frequency kink modes – kink magnetoplasmons (KMPs) – in a GaAs/AlGaAs two-dimensional electron gas (2DEG) system. These KMPs arise at a domain boundary projected from an externally-patterned magnetic field onto a uniform 2DEG. They propagate unidirectionally along the boundary, protected by a difference of gap Chern numbers (± 1) in the two domains. They exhibit large tunability under an applied magnetic field or gate voltage, and clear signatures of nonreciprocity even under weak-coupling to evanescent photons. |
| first_indexed | 2024-09-23T12:47:32Z |
| format | Article |
| id | mit-1721.1/136472 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T12:47:32Z |
| publishDate | 2021 |
| publisher | Springer Science and Business Media LLC |
| record_format | dspace |
| spelling | mit-1721.1/1364722023-09-12T19:49:26Z Topological kink plasmons on magnetic-domain boundaries Jin, Dafei Xia, Yang Christensen, Thomas Freeman, Matthew Wang, Siqi Fong, King Yan Gardner, Geoffrey C Fallahi, Saeed Hu, Qing Wang, Yuan Engel, Lloyd Xiao, Zhi-Li Manfra, Michael J Fang, Nicholas X Zhang, Xiang Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Department of Mechanical Engineering © 2019, The Author(s). Two-dimensional topological materials bearing time reversal-breaking magnetic fields support protected one-way edge modes. Normally, these edge modes adhere to physical edges where material properties change abruptly. However, even in homogeneous materials, topology still permits a unique form of edge modes – kink modes – residing at the domain boundaries of magnetic fields within the materials. This scenario, despite being predicted in theory, has rarely been demonstrated experimentally. Here, we report our observation of topologically-protected high-frequency kink modes – kink magnetoplasmons (KMPs) – in a GaAs/AlGaAs two-dimensional electron gas (2DEG) system. These KMPs arise at a domain boundary projected from an externally-patterned magnetic field onto a uniform 2DEG. They propagate unidirectionally along the boundary, protected by a difference of gap Chern numbers (± 1) in the two domains. They exhibit large tunability under an applied magnetic field or gate voltage, and clear signatures of nonreciprocity even under weak-coupling to evanescent photons. 2021-10-27T20:35:33Z 2021-10-27T20:35:33Z 2019 2020-07-08T18:45:15Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/136472 en 10.1038/S41467-019-12092-X Nature Communications Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf Springer Science and Business Media LLC Nature |
| spellingShingle | Jin, Dafei Xia, Yang Christensen, Thomas Freeman, Matthew Wang, Siqi Fong, King Yan Gardner, Geoffrey C Fallahi, Saeed Hu, Qing Wang, Yuan Engel, Lloyd Xiao, Zhi-Li Manfra, Michael J Fang, Nicholas X Zhang, Xiang Topological kink plasmons on magnetic-domain boundaries |
| title | Topological kink plasmons on magnetic-domain boundaries |
| title_full | Topological kink plasmons on magnetic-domain boundaries |
| title_fullStr | Topological kink plasmons on magnetic-domain boundaries |
| title_full_unstemmed | Topological kink plasmons on magnetic-domain boundaries |
| title_short | Topological kink plasmons on magnetic-domain boundaries |
| title_sort | topological kink plasmons on magnetic domain boundaries |
| url | https://hdl.handle.net/1721.1/136472 |
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