Fermi-arc-induced vortex structure in Weyl beam shifts
In periodic media, despite the close relationship between geometrical effects in the bulk and topological surface states, the two are typically probed separately. We show that when beams in a Weyl medium reflect off an interface with a gapped medium, the trajectory is influenced by both bulk geometr...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2019
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| Online Access: | https://hdl.handle.net/10356/105301 http://hdl.handle.net/10220/48645 |
| _version_ | 1826122623207079936 |
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| author | Chattopadhyay, Udvas Shi, Li-kun Zhang, Baile Song, Justin Chien Wen Chong, Yi Dong |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Chattopadhyay, Udvas Shi, Li-kun Zhang, Baile Song, Justin Chien Wen Chong, Yi Dong |
| author_sort | Chattopadhyay, Udvas |
| collection | NTU |
| description | In periodic media, despite the close relationship between geometrical effects in the bulk and topological surface states, the two are typically probed separately. We show that when beams in a Weyl medium reflect off an interface with a gapped medium, the trajectory is influenced by both bulk geometrical effects and the Fermi arc surface states. The reflected beam experiences a displacement, analogous to the Goos-Hänchen or Imbert-Fedorov shifts, that forms a half-vortex in the two-dimensional surface momentum space. The half-vortex is centered where the Fermi arc of the reflecting surface touches the Weyl cone, with the magnitude of the shift scaling as an inverse square root away from the touching point, and diverging at the touching point. This striking feature provides a way to use bulk transport to probe the topological characteristics of a Weyl medium. |
| first_indexed | 2024-10-01T05:51:31Z |
| format | Journal Article |
| id | ntu-10356/105301 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:51:31Z |
| publishDate | 2019 |
| record_format | dspace |
| spelling | ntu-10356/1053012023-02-28T19:37:49Z Fermi-arc-induced vortex structure in Weyl beam shifts Chattopadhyay, Udvas Shi, Li-kun Zhang, Baile Song, Justin Chien Wen Chong, Yi Dong School of Physical and Mathematical Sciences Centre for Disruptive Photonic Technologies (CDPT) Topological Materials DRNTU::Science::Physics Topological Effects in Photonic Systems In periodic media, despite the close relationship between geometrical effects in the bulk and topological surface states, the two are typically probed separately. We show that when beams in a Weyl medium reflect off an interface with a gapped medium, the trajectory is influenced by both bulk geometrical effects and the Fermi arc surface states. The reflected beam experiences a displacement, analogous to the Goos-Hänchen or Imbert-Fedorov shifts, that forms a half-vortex in the two-dimensional surface momentum space. The half-vortex is centered where the Fermi arc of the reflecting surface touches the Weyl cone, with the magnitude of the shift scaling as an inverse square root away from the touching point, and diverging at the touching point. This striking feature provides a way to use bulk transport to probe the topological characteristics of a Weyl medium. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) Published version 2019-06-11T09:27:07Z 2019-12-06T21:48:55Z 2019-06-11T09:27:07Z 2019-12-06T21:48:55Z 2019 Journal Article Chattopadhyay, U., Shi, L., Zhang, B., Song, J. C. W., & Chong, Y. D. (2019). Fermi-arc-induced vortex structure in Weyl beam shifts. Physical Review Letters, 122(6), 066602-. doi:10.1103/PhysRevLett.122.066602 0031-9007 https://hdl.handle.net/10356/105301 http://hdl.handle.net/10220/48645 10.1103/PhysRevLett.122.066602 en Physical Review Letters https://doi.org/10.21979/N9/CVSM4Z © 2019 American Physical Society. All rights reserved. This paper was published in Physical Review Letters and is made available with permission of American Physical Society. 6 p. application/pdf |
| spellingShingle | Topological Materials DRNTU::Science::Physics Topological Effects in Photonic Systems Chattopadhyay, Udvas Shi, Li-kun Zhang, Baile Song, Justin Chien Wen Chong, Yi Dong Fermi-arc-induced vortex structure in Weyl beam shifts |
| title | Fermi-arc-induced vortex structure in Weyl beam shifts |
| title_full | Fermi-arc-induced vortex structure in Weyl beam shifts |
| title_fullStr | Fermi-arc-induced vortex structure in Weyl beam shifts |
| title_full_unstemmed | Fermi-arc-induced vortex structure in Weyl beam shifts |
| title_short | Fermi-arc-induced vortex structure in Weyl beam shifts |
| title_sort | fermi arc induced vortex structure in weyl beam shifts |
| topic | Topological Materials DRNTU::Science::Physics Topological Effects in Photonic Systems |
| url | https://hdl.handle.net/10356/105301 http://hdl.handle.net/10220/48645 |
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