A four-level conductance switch can be created by using a scanning tunnelling microscope to remove a hydrogen atom from the central cavity of a porphyrin molecule.
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Liljeroth, P. Flipping a single proton switch. Nature Nanotech 7, 5–6 (2012). https://doi.org/10.1038/nnano.2011.242
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DOI: https://doi.org/10.1038/nnano.2011.242
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