The isolated symmetry points of photonic graphene are unstable in three dimensions. Researchers have now proposed topologically robust points by using minimal surfaces and employing symmetry-breaking ideas from quantum field theory.
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Fleischer, J. Achieving robust Weyl points. Nature Photon 7, 268–269 (2013). https://doi.org/10.1038/nphoton.2013.73
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DOI: https://doi.org/10.1038/nphoton.2013.73