Ideal unconventional Weyl point in a chiral photonic metamaterial
Unconventional Weyl points (WPs), carrying topological charge 2 or higher, possess interesting properties different from ordinary charge-1 WPs, including multiple Fermi arcs that stretch over a large portion of the Brillouin zone. Thus far, such WPs have been observed in chiral materials and acousti...
| Main Authors: | , , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2020
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/145165 |
| _version_ | 1811676649912008704 |
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| author | Yang, Yihao Gao, Zhen Feng, Xiaolong Huang, Yue-Xin Zhou, Peiheng Yang, Shengyuan A. Chong, Yidong Zhang, Baile |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Yang, Yihao Gao, Zhen Feng, Xiaolong Huang, Yue-Xin Zhou, Peiheng Yang, Shengyuan A. Chong, Yidong Zhang, Baile |
| author_sort | Yang, Yihao |
| collection | NTU |
| description | Unconventional Weyl points (WPs), carrying topological charge 2 or higher, possess interesting properties different from ordinary charge-1 WPs, including multiple Fermi arcs that stretch over a large portion of the Brillouin zone. Thus far, such WPs have been observed in chiral materials and acoustic metamaterials, but there has been no clean demonstration in photonics in which the unconventional photonic WPs are separated from trivial bands. We experimentally realize an ideal symmetry-protected photonic charge-2 WP in a three-dimensional topological chiral microwave metamaterial. We use field mapping to directly observe the projected bulk dispersion, as well as the two long surface arcs that form a noncontractible loop wrapping around the surface Brillouin zone. The surface states span a record-wide frequency window of around 22.7% relative bandwidth. We demonstrate that the surface states exhibit a novel topological self-collimation property and are robust against disorder. This work provides an ideal photonic platform for exploring fundamental physics and applications of unconventional WPs. |
| first_indexed | 2024-10-01T02:24:50Z |
| format | Journal Article |
| id | ntu-10356/145165 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:24:50Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1451652023-02-28T20:04:17Z Ideal unconventional Weyl point in a chiral photonic metamaterial Yang, Yihao Gao, Zhen Feng, Xiaolong Huang, Yue-Xin Zhou, Peiheng Yang, Shengyuan A. Chong, Yidong Zhang, Baile School of Physical and Mathematical Sciences Centre for Disruptive Photonic Technologies (CDPT) The Photonics Institute Science::Physics Weyl Point Metamaterial Unconventional Weyl points (WPs), carrying topological charge 2 or higher, possess interesting properties different from ordinary charge-1 WPs, including multiple Fermi arcs that stretch over a large portion of the Brillouin zone. Thus far, such WPs have been observed in chiral materials and acoustic metamaterials, but there has been no clean demonstration in photonics in which the unconventional photonic WPs are separated from trivial bands. We experimentally realize an ideal symmetry-protected photonic charge-2 WP in a three-dimensional topological chiral microwave metamaterial. We use field mapping to directly observe the projected bulk dispersion, as well as the two long surface arcs that form a noncontractible loop wrapping around the surface Brillouin zone. The surface states span a record-wide frequency window of around 22.7% relative bandwidth. We demonstrate that the surface states exhibit a novel topological self-collimation property and are robust against disorder. This work provides an ideal photonic platform for exploring fundamental physics and applications of unconventional WPs. Ministry of Education (MOE) Published version This work was supported by the Singapore Ministry of Education under Grants No. MOE2016-T3-1-006, No. MOE2018-T2-1-022 (S), and No. MOE2019-T2-1-001. 2020-12-14T08:33:24Z 2020-12-14T08:33:24Z 2020 Journal Article Yang, Y., Gao, Z., Feng, X., Huang, Y.-X., Zhou, P., Yang, S. A., . . . Zhang, B. (2020). Ideal unconventional Weyl point in a chiral photonic metamaterial. Physical Review Letters, 125(14), 143001-. doi:10.1103/PhysRevLett.125.143001 0031-9007 https://hdl.handle.net/10356/145165 10.1103/PhysRevLett.125.143001 33064518 14 125 en MOE2016-T3-1-006 MOE2018-T2-1-022 MOE2019-T2-1-001 Physical Review Letters 10.21979/N9/0ULJ7Y © 2020 American Physical Society. All rights reserved. This paper was published in Physical Review Letters and is made available with permission of American Physical Society. application/pdf |
| spellingShingle | Science::Physics Weyl Point Metamaterial Yang, Yihao Gao, Zhen Feng, Xiaolong Huang, Yue-Xin Zhou, Peiheng Yang, Shengyuan A. Chong, Yidong Zhang, Baile Ideal unconventional Weyl point in a chiral photonic metamaterial |
| title | Ideal unconventional Weyl point in a chiral photonic metamaterial |
| title_full | Ideal unconventional Weyl point in a chiral photonic metamaterial |
| title_fullStr | Ideal unconventional Weyl point in a chiral photonic metamaterial |
| title_full_unstemmed | Ideal unconventional Weyl point in a chiral photonic metamaterial |
| title_short | Ideal unconventional Weyl point in a chiral photonic metamaterial |
| title_sort | ideal unconventional weyl point in a chiral photonic metamaterial |
| topic | Science::Physics Weyl Point Metamaterial |
| url | https://hdl.handle.net/10356/145165 |
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