Statistical study of stacked/coupled site-controlled pyramidal quantum dots and their excitonic properties

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Moroni, Stefano T.
Chung, Tung-Hsun
Juska, Gediminas
Gocalińska, Agnieszka M.
Pelucchi, Emanuele
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We report on stacked multiple quantum dots (QDs) formed inside inverted pyramidal recesses, which allow for the precise positioning of the QDs themselves. Specifically, we fabricated double QDs with varying inter-dot distances and ensembles with more than two nominally highly symmetric QDs. For each, the effect of the interaction between QDs is studied by characterizing a large number of QDs through photoluminescence spectroscopy. A clear red-shift of the emission energy is observed together with a change in the orientation of its polarization, suggesting an increasing interaction between the QDs. Finally, we show how stacked QDs can help influencing the charging of the excitonic complexes.
Quantum dots , Luminescence spectroscopy , Emission spectra , Doppler effect , Polarization , Excitons , Gallium arsenide , III-V semiconductors , Indium compounds , Photoluminescence , Red shift , Semiconductor quantum dots , Statistical analysis
Moroni, S. T., Chung, T. H., Juska, G., Gocalinska, A. and Pelucchi, E. (2017) 'Statistical study of stacked/coupled site-controlled pyramidal quantum dots and their excitonic properties', Applied Physics Letters, 111(8), 083103 (5 pp). doi:10.1063/1.4985259
© 2017, AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Appl. Phys. Lett. 111, 083103 (2017) and may be found at