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dc.contributor.authorLiu, Gui-Gengen_US
dc.contributor.authorZhou, Peihengen_US
dc.contributor.authorYang, Yihaoen_US
dc.contributor.authorXue, Haoranen_US
dc.contributor.authorRen, Xinen_US
dc.contributor.authorLin, Xiaoen_US
dc.contributor.authorSun, Hong-xiangen_US
dc.contributor.authorBi, Leien_US
dc.contributor.authorChong, Yidongen_US
dc.contributor.authorZhang, Baileen_US
dc.identifier.citationLiu, 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-zen_US
dc.description.abstractAt 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.en_US
dc.description.sponsorshipMOE (Min. of Education, S’pore)en_US
dc.relation.ispartofNature Communicationsen_US
dc.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
dc.titleObservation of an unpaired photonic Dirac pointen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Physical and Mathematical Sciencesen_US
dc.description.versionPublished versionen_US
dc.subject.keywordsQuantum Physicsen_US
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