Electron micrograph of a three-dimensional metamaterial sitting on a glass substrate. Selected for a Synopsis in Physics and an Editors’ Suggestion.

From the article:

Experimental Evidence for Sign Reversal of the Hall Coefficient in Three-Dimensional Metamaterials
Christian Kern, Muamer Kadic, and Martin Wegener
Phys. Rev. Lett. 118, 016601 (2017)

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