The detection of unusual 'mirage' energy bands in photoemission spectra of single-atom layers of iron selenide reveals the probable cause of high-temperature superconductivity in these artificial structures. See Letter p.245
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Zaanen, J. Electron mirages in an iron salt. Nature 515, 205–206 (2014). https://doi.org/10.1038/515205a
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DOI: https://doi.org/10.1038/515205a
