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(Color online) QD density, as measured from AFM images plotted as a function of InAs deposition rate. The solid line is a guide for the eyes. Inset: AFM images of 2.1 ML InAs deposited at the following growth rates: (a) , (b) , (c) , (d) .
Evolution of PL emission wavelength as a function of InAs growth rate. The solid line is a guide for the eyes. Inset: PL spectra at 10 K and RT of 2.1 ML InAs QDs grown at with a 5 nm thick capping layer.
PL spectra of QDs embedded in a microcavity ( diameter mesa) at different excitation powers. Peaks X and XX are attributed to exciton and biexciton emission.
Integrated intensities of X and XX peaks as a function of the laser excitation power, under continuous-wave excitation. Solid (dashed) line shows the fitted power dependence of X (XX) intensity and the inset reports the dependence of the XX-PL intensity versus the X-PL intensity in log-log scale.
PL spectra of a single QD in a microcavity ( diameter mesa) at different temperatures (excitation power , pump wavelength ).
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