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(a) A scheme of the employed absorption setup. (b) Schematic representation of the investigated laser structures. (c) Details of the core region.
Polarization-dependent absorption spectra (upper plot) and PL spectrum recorded at at a high excitation density (lower plot). The estimated onsets of the lowest energy bands of crossed transitions are indicatively shown by arrows (to be compared with Fig. 4); 0D confined transitions are numbered from 1 to 4.
Absorption spectra as a function of the reverse applied bias for both states of polarization. The inset in the upper plot shows the energy shift for the and transitions.
Schematic representation of the transitions involved in QD absorption (labeled with their energy in eV). The dashed-dot line represents the QW ground state PL transition.
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