Topological antichiral surface states in a magnetic Weyl photonic crystal
Chiral edge states that propagate oppositely at two parallel strip edges are a hallmark feature of Chern insulators which were first proposed in the celebrated two-dimensional (2D) Haldane model. Subsequently, counterintuitive antichiral edge states that propagate in the same direction at two parall...
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Science::Physics Crystal Microwave Radiation Xi, Xiang Yan, Bei Yang, Linyun Meng, Yan Zhu, Zhen-Xiao Chen, Jing-Ming Wang, Ziyao Zhou, Peiheng Shum, Perry Ping Yang, Yihao Chen, Hongsheng Mandal, Subhaskar Liu, Gui-Geng Zhang, Baile Gao, Zhen Topological antichiral surface states in a magnetic Weyl photonic crystal |
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Chiral edge states that propagate oppositely at two parallel strip edges are a hallmark feature of Chern insulators which were first proposed in the celebrated two-dimensional (2D) Haldane model. Subsequently, counterintuitive antichiral edge states that propagate in the same direction at two parallel strip edges were discovered in a 2D modified Haldane model. Recently, chiral surface states, the 2D extension of one-dimensional (1D) chiral edge states, have also been observed in a photonic analogue of a 3D Haldane model. However, despite many recent advances in antichiral edge states and chiral surface states, antichiral surface states, the 2D extension of 1D antichiral edge states, have never been realized in any physical system. Here, we report the experimental observation of antichiral surface states by constructing a 3D modified Haldane model in a magnetic Weyl photonic crystal with two pairs of frequency-shifted Weyl points (WPs). The 3D magnetic Weyl photonic crystal consists of gyromagnetic cylinders with opposite magnetization in different triangular sublattices of a 3D honeycomb lattice. Using microwave field-mapping measurements, unique properties of antichiral surface states have been observed directly, including the antichiral robust propagation, tilted surface dispersion, a single open Fermi arc connecting two projected WPs and a single Fermi loop winding around the surface Brillouin zone (BZ). These results extend the scope of antichiral topological states and enrich the family of magnetic Weyl semimetals. |
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School of Physical and Mathematical Sciences |
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School of Physical and Mathematical Sciences Xi, Xiang Yan, Bei Yang, Linyun Meng, Yan Zhu, Zhen-Xiao Chen, Jing-Ming Wang, Ziyao Zhou, Peiheng Shum, Perry Ping Yang, Yihao Chen, Hongsheng Mandal, Subhaskar Liu, Gui-Geng Zhang, Baile Gao, Zhen |
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Article |
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Xi, Xiang Yan, Bei Yang, Linyun Meng, Yan Zhu, Zhen-Xiao Chen, Jing-Ming Wang, Ziyao Zhou, Peiheng Shum, Perry Ping Yang, Yihao Chen, Hongsheng Mandal, Subhaskar Liu, Gui-Geng Zhang, Baile Gao, Zhen |
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Xi, Xiang |
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Topological antichiral surface states in a magnetic Weyl photonic crystal |
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Topological antichiral surface states in a magnetic Weyl photonic crystal |
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Topological antichiral surface states in a magnetic Weyl photonic crystal |
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Topological antichiral surface states in a magnetic Weyl photonic crystal |
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Topological antichiral surface states in a magnetic Weyl photonic crystal |
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topological antichiral surface states in a magnetic weyl photonic crystal |
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2023 |
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https://hdl.handle.net/10356/166244 |
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sg-ntu-dr.10356-1662442023-04-24T15:34:59Z Topological antichiral surface states in a magnetic Weyl photonic crystal Xi, Xiang Yan, Bei Yang, Linyun Meng, Yan Zhu, Zhen-Xiao Chen, Jing-Ming Wang, Ziyao Zhou, Peiheng Shum, Perry Ping Yang, Yihao Chen, Hongsheng Mandal, Subhaskar Liu, Gui-Geng Zhang, Baile Gao, Zhen School of Physical and Mathematical Sciences Centre for Disruptive Photonic Technologies (CDPT) The Photonics Institute Science::Physics Crystal Microwave Radiation Chiral edge states that propagate oppositely at two parallel strip edges are a hallmark feature of Chern insulators which were first proposed in the celebrated two-dimensional (2D) Haldane model. Subsequently, counterintuitive antichiral edge states that propagate in the same direction at two parallel strip edges were discovered in a 2D modified Haldane model. Recently, chiral surface states, the 2D extension of one-dimensional (1D) chiral edge states, have also been observed in a photonic analogue of a 3D Haldane model. However, despite many recent advances in antichiral edge states and chiral surface states, antichiral surface states, the 2D extension of 1D antichiral edge states, have never been realized in any physical system. Here, we report the experimental observation of antichiral surface states by constructing a 3D modified Haldane model in a magnetic Weyl photonic crystal with two pairs of frequency-shifted Weyl points (WPs). The 3D magnetic Weyl photonic crystal consists of gyromagnetic cylinders with opposite magnetization in different triangular sublattices of a 3D honeycomb lattice. Using microwave field-mapping measurements, unique properties of antichiral surface states have been observed directly, including the antichiral robust propagation, tilted surface dispersion, a single open Fermi arc connecting two projected WPs and a single Fermi loop winding around the surface Brillouin zone (BZ). These results extend the scope of antichiral topological states and enrich the family of magnetic Weyl semimetals. Ministry of Education (MOE) Nanyang Technological University National Research Foundation (NRF) Published version Z.G. acknowledges support from the National Natural Science Foundation of China under Grant No. 12104211, Shenzhen Science and Technology Innovation Commission under Grant No. 20220815111105001, and SUSTech under Grant No. Y01236148 and No. Y01236248. Work at Nanyang Technological University was sponsored by Singapore Ministry of Education Academic Research Fund Tier 3 Grant MOE2016-T3-1-006, and the National Research Foundation Competitive Research Program NRF-CRP23-2019-0007. Work at Zhejiang University was sponsored by the National Natural Science Foundation of China under grant number 62175215 and the Fundamental Research Funds for the Central Universities (2021FZZX001-19). 2023-04-20T01:38:55Z 2023-04-20T01:38:55Z 2023 Journal Article Xi, X., Yan, B., Yang, L., Meng, Y., Zhu, Z., Chen, J., Wang, Z., Zhou, P., Shum, P. P., Yang, Y., Chen, H., Mandal, S., Liu, G., Zhang, B. & Gao, Z. (2023). Topological antichiral surface states in a magnetic Weyl photonic crystal. Nature Communications, 14(1), 1991-. https://dx.doi.org/10.1038/s41467-023-37710-7 2041-1723 https://hdl.handle.net/10356/166244 10.1038/s41467-023-37710-7 37031270 2-s2.0-85151992292 1 14 1991 en MOE2016-T3-1-006 NRF-CRP23-2019-0007 Nature Communications © 2023 The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. application/pdf |