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

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

Moroni, Stefano T.; Chung, Tung-Hsun; Juska, Gediminas; Gocalinska, Agnieszka M.; Pelucchi, Emanuele
Date: 2017-08-22
Copyright: © 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 http://aip.scitation.org/doi/abs/10.1063/1.4985259
Related: http://aip.scitation.org/doi/abs/10.1063/1.4985259
Full text restriction information: Access to this article is restricted until 12 months after publication by request of the publisher.
Restriction lift date: 2018-08-22
Citation: 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
Published Version: 10.1063/1.4985259

Abstract:

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.

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