Quantitative atomic-scale images of electric potentials at surfaces have now been obtained with a non-contact atomic force microscope by functionalizing the tip as a quantum dot sensor.
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Persson, M. Electric potentials at the atomic scale. Nat. Mater. 18, 773–774 (2019). https://doi.org/10.1038/s41563-019-0383-7
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DOI: https://doi.org/10.1038/s41563-019-0383-7