It is now possible to prepare a semiconductor quantum dot that contains a single magnetic atom, and then add just one extra electron or 'hole' to it, opening up the possibility of a new era in spintronics.
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Erwin, S. Spin doctors play with single electrons. Nature Nanotech 1, 98–99 (2006). https://doi.org/10.1038/nnano.2006.117
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DOI: https://doi.org/10.1038/nnano.2006.117
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