The topological valley Hall effect was predicted as a consequence of the bulk topology of electronic systems. Now it has been observed in photonic crystals, showing that both topology and valley are innate to classical as well as quantum systems.
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Zhang, F. Brought to light. Nat. Phys. 14, 111–113 (2018). https://doi.org/10.1038/nphys4331
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DOI: https://doi.org/10.1038/nphys4331
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