Angle-resolved photoemission spectroscopy of MoS2 doped with Rb atoms unveiled the existence of polarons, whose presence seems to coincide with the onset of superconductivity.
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Rossnagel, K. More than electrons. Nature Mater 17, 658–660 (2018). https://doi.org/10.1038/s41563-018-0131-4
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DOI: https://doi.org/10.1038/s41563-018-0131-4