Figure 2
From: InAs/AlGaAs quantum dots for single-photon emission in a red spectral range
(a) μ-Pl spectra obtained in sample A, comprising emission lines of an exciton, a biexciton, and a positive trion. The insert shows a pump power dependence of the exciton and biexciton intensities. (b) Representative μ-PL spectra demonstrating nearly unsplit emission lines. The insert represents enlarged vertices of the lines. (c) An example of the emission lines with large positive FSS. The insert shows the vertices of the lines with negative FSS. Solid black and dash red lines in Figs (b,c) represent spectra for orthogonal linear polarizations corresponding to [110] and [1\(\overline{1}\)0] crystal directions of the QD sample. (d) Measured FSS as a function of the photon energy for samples A and B. The red and blue horizontal stripes correspond to unsplit emission lines with virtually zero FSS, detected in samples A and B, respectively.
