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|Title:||Ideal unconventional Weyl point in a chiral photonic metamaterial||Authors:||Yang, Yihao
Yang, Shengyuan A.
|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.||URI:||https://hdl.handle.net/10356/145165||ISSN:||0031-9007||DOI:||10.1103/PhysRevLett.125.143001||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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