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(Color online) Photoluminescence measured from a single quantum dot. The three sharp peaks correspond to emission from the neutral exciton and biexciton and the positively charged exciton states, as labeled. The simplified energy level diagrams illustrate the initial and final states involved in the main emission lines ( represents a single hole). The photons from the biexciton decay are typically horizontally (H) and vertically (V) polarized.
(Color online) Photoluminescence from a single quantum dot embedded in a structure as a function of the bias applied between the - and contacts. Blue areas indicate high count rates and white areas indicate low count rates.
(Color online) Intensities of the emission lines in Fig. 2 plotted as a function of the bias applied to the device: (a) the integrated intensities of the photoluminescence from the negatively charged , neutral , bi- , and positively charged exciton states. (b) The ratio of the exciton and biexciton states’ lifetimes and the degree of rectilinear polarization correlation between the biexciton and exciton photons. Error bars span 2 standard deviations of the random error. Where not shown, the random error is smaller than the symbol size.
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