Abstract
The inhomogeneous broadening in the luminescence spectra of ordered arrays of pyramidal GaAs∕AlGaAs semiconductor quantum dots (QDs) was studied as a function of the dot size. Dot arrays with inhomogeneous broadening as small as 4.1meV and a corresponding ground state to first excited state transition separation of 28meV were obtained. By evaluating the QD energy levels using a multiband k∙p model, the authors estimated that the observed inhomogeneous broadening corresponds to dot height fluctuations of about 1–2 ML across the array.
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