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Title: Ideal unconventional Weyl point in a chiral photonic metamaterial
Authors: Yang, Yihao
Gao, Zhen
Feng, Xiaolong
Huang, Yue-Xin
Zhou, Peiheng
Yang, Shengyuan A.
Chong, Yidong
Zhang, Baile
Keywords: Science::Physics
Issue Date: 2020
Source: 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
Project: MOE2016-T3-1-006 
Journal: Physical Review Letters 
Abstract: 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.
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.125.143001
DOI (Related Dataset): 10.21979/N9/0ULJ7Y
Schools: School of Physical and Mathematical Sciences 
Research Centres: Centre for Disruptive Photonic Technologies (CDPT) 
The Photonics Institute 
Rights: © 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.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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