Abnormal nonlinear optical responses on the surface of topological materials
<jats:title>Abstract</jats:title><jats:p>The nonlinear optical (NLO) responses of topological materials are under active research. Most previous works studied the surface and bulk NLO responses separately. Here we develop a generic Green’s function framework to investigate the surf...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
Springer Science and Business Media LLC
2022
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| Online Access: | https://hdl.handle.net/1721.1/143456 |
| _version_ | 1826189177198215168 |
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| author | Xu, Haowei Wang, Hua Li, Ju |
| author2 | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Xu, Haowei Wang, Hua Li, Ju |
| author_sort | Xu, Haowei |
| collection | MIT |
| description | <jats:title>Abstract</jats:title><jats:p>The nonlinear optical (NLO) responses of topological materials are under active research. Most previous works studied the surface and bulk NLO responses separately. Here we develop a generic Green’s function framework to investigate the surface and bulk NLO responses together. We reveal that the topological surface can behave disparately from the bulk under light illumination. Remarkably, the photocurrents on the surface can flow in opposite directions to those in the bulk interior, and the light-induced spin current on the surface can be orders of magnitude stronger than its bulk counterpart on a per-volume basis. We also study the responses under inhomogeneous field and higher-order NLO effect, which are all distinct on the surface. These anomalous surface responses suggest that light can be a valuable tool for probing the surface states of topological materials. Besides, the surface effects should be prudently considered when investigating the optical properties of topological materials.</jats:p> |
| first_indexed | 2024-09-23T08:11:04Z |
| format | Article |
| id | mit-1721.1/143456 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T08:11:04Z |
| publishDate | 2022 |
| publisher | Springer Science and Business Media LLC |
| record_format | dspace |
| spelling | mit-1721.1/1434562023-01-30T21:41:58Z Abnormal nonlinear optical responses on the surface of topological materials Xu, Haowei Wang, Hua Li, Ju Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Massachusetts Institute of Technology. Department of Materials Science and Engineering <jats:title>Abstract</jats:title><jats:p>The nonlinear optical (NLO) responses of topological materials are under active research. Most previous works studied the surface and bulk NLO responses separately. Here we develop a generic Green’s function framework to investigate the surface and bulk NLO responses together. We reveal that the topological surface can behave disparately from the bulk under light illumination. Remarkably, the photocurrents on the surface can flow in opposite directions to those in the bulk interior, and the light-induced spin current on the surface can be orders of magnitude stronger than its bulk counterpart on a per-volume basis. We also study the responses under inhomogeneous field and higher-order NLO effect, which are all distinct on the surface. These anomalous surface responses suggest that light can be a valuable tool for probing the surface states of topological materials. Besides, the surface effects should be prudently considered when investigating the optical properties of topological materials.</jats:p> 2022-06-15T18:16:06Z 2022-06-15T18:16:06Z 2022-12 2022-06-15T17:52:28Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/143456 Xu, Haowei, Wang, Hua and Li, Ju. 2022. "Abnormal nonlinear optical responses on the surface of topological materials." npj Computational Materials, 8 (1). en 10.1038/s41524-022-00782-y npj Computational Materials Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf Springer Science and Business Media LLC Nature |
| spellingShingle | Xu, Haowei Wang, Hua Li, Ju Abnormal nonlinear optical responses on the surface of topological materials |
| title | Abnormal nonlinear optical responses on the surface of topological materials |
| title_full | Abnormal nonlinear optical responses on the surface of topological materials |
| title_fullStr | Abnormal nonlinear optical responses on the surface of topological materials |
| title_full_unstemmed | Abnormal nonlinear optical responses on the surface of topological materials |
| title_short | Abnormal nonlinear optical responses on the surface of topological materials |
| title_sort | abnormal nonlinear optical responses on the surface of topological materials |
| url | https://hdl.handle.net/1721.1/143456 |
| work_keys_str_mv | AT xuhaowei abnormalnonlinearopticalresponsesonthesurfaceoftopologicalmaterials AT wanghua abnormalnonlinearopticalresponsesonthesurfaceoftopologicalmaterials AT liju abnormalnonlinearopticalresponsesonthesurfaceoftopologicalmaterials |