Higher-order topological states that are robust against certain classes of disorder and pinned to lattice corners are now observed in photonics platforms.
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Özdemir, Ş.K., El-Ganainy, R. Topological lattices lit at the corners. Nat. Photonics 13, 660–662 (2019). https://doi.org/10.1038/s41566-019-0523-2
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DOI: https://doi.org/10.1038/s41566-019-0523-2