This letter presents a technique for the investigation of the fine structure and spin properties of quantum dot (QD) ensembles, allowing measurement of QD parameters previously accessible only from studies of individual QDs. We show how μeV splittings can be deduced from information contained in the shape of the ensemble polarization spectra and demonstrate the effectiveness of this technique by measuring Zeeman splittings, g-factors, and sensitivity to QD fine structure effects.

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Such spin redistribution effects may be expected to reduce at higher temperature. However, the measurement of the underlying energy splitting outlined in this paper, being purely spectroscopic, is not be expected to display a significant temperature dependence.

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