The sign of a material's charge carriers is usually reflected in the sign of the 'Hall voltage'. But for a structure inspired by chain mail, altering its geometry inverts the Hall voltage, even if the charge carriers are unchanged.
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Notomi, M. Chain mail reverses the Hall effect. Nature 544, 44–45 (2017). https://doi.org/10.1038/nature21902
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DOI: https://doi.org/10.1038/nature21902