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Title: Observation of an unpaired photonic Dirac point
Authors: Liu, Gui-Geng
Zhou, Peiheng
Yang, Yihao
Xue, Haoran
Ren, Xin
Lin, Xiao
Sun, Hong-xiang
Bi, Lei
Chong, Yidong
Zhang, Baile
Keywords: Science::Physics
Issue Date: 2020
Source: Liu, G.-G., Zhou, P., Yang, Y., Xue, H., Ren, X., Lin, X., ... Zhang, B. (2020). Observation of an unpaired photonic Dirac point. Nature Communications, 11. doi:10.1038/s41467-020-15801-z
Journal: Nature Communications
Abstract: At photonic Dirac points, electromagnetic waves are governed by the same equations as two-component massless relativistic fermions. However, photonic Dirac points are known to occur in pairs in “photonic graphene” and other similar photonic crystals, which necessitates special precautions to excite only one valley state. Systems hosting unpaired photonic Dirac points are significantly harder to realize, as they require broken time-reversal symmetry. Here, we report on the observation of an unpaired Dirac point in a planar two-dimensional photonic crystal. The structure incorporates gyromagnetic materials, which break time-reversal symmetry; the unpaired Dirac point occurs when a parity-breaking parameter is fine-tuned to a topological transition between a photonic Chern insulator and a conventional photonic insulator phase. Evidence for the unpaired Dirac point is provided by transmission and field-mapping experiments, including a demonstration of strongly non-reciprocal reflection. This unpaired Dirac point may have applications in valley filters and angular selective photonic devices.
ISSN: 2041-1723
DOI: 10.1038/s41467-020-15801-z
DOI (Related Dataset):
Schools: School of Physical and Mathematical Sciences 
Rights: © 2020 The Author(s) (Nature Publishing Group) (Open Access). 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
Fulltext Permission: open
Fulltext Availability: With Fulltext
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