Colloidal quantum dots are efficient nanoscopic light emitters with interesting applications from optoelectronics to biomedical imaging. Their polarizability has now been measured directly by probing the electronic response without electrical contacts.
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Bratschitsch, R., Leitenstorfer, A. Artificial atoms for quantum optics. Nature Mater 5, 855–856 (2006). https://doi.org/10.1038/nmat1768
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DOI: https://doi.org/10.1038/nmat1768
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