By forming a heterostructure interface, and by judicious choice of crystallographic orientation, piezoelectrics are developed that show expansion or contraction along all axes on application of an electric field.
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Eliseev, E.A., Morozovska, A.N. Breaking symmetry creates polar auxeticity. Nat. Mater. 23, 37–38 (2024). https://doi.org/10.1038/s41563-023-01750-7
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DOI: https://doi.org/10.1038/s41563-023-01750-7
