Introducing non-local effects to metamaterials increases the complexity of their dispersion relation, which allows carefully designed elastic structures to mimic the peculiar roton behaviour of correlated quantum superfluids.
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Fleury, R. Non-local oddities. Nat. Phys. 17, 766–767 (2021). https://doi.org/10.1038/s41567-021-01281-5
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DOI: https://doi.org/10.1038/s41567-021-01281-5
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