A quantum dot is usually charged by inserting electrons. But electrons can also be removed from a neutral dot. Unexpectedly, positively charged dots are different from highly charged negative ones, which have their own peculiarities.
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Gammon, D. An optical point of view. Nature Phys 3, 761–762 (2007). https://doi.org/10.1038/nphys769
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DOI: https://doi.org/10.1038/nphys769