A theoretical framework for the design of so-called perturbative metamaterials, based on weakly interacting unit cells, has led to the experimental demonstration of a quadrupole topological insulator.
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Fruchart, M., Vitelli, V. The effective way. Nature Mater 17, 292–293 (2018). https://doi.org/10.1038/s41563-018-0050-4
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DOI: https://doi.org/10.1038/s41563-018-0050-4