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Polarization dependence study of electroluminescence and absorption from InAs / GaAs columnar quantum dots

Ridha, Philipp, Li, Lianhe, Fiore, Andrea, Patriarche, Gilles, Mexis, Meletios and Smowton, Peter Michael 2007. Polarization dependence study of electroluminescence and absorption from InAs / GaAs columnar quantum dots. Applied Physics Letters 91 (19) , 191123. 10.1063/1.2811720

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Abstract

Semiconductor optical amplifiers based on InGaAs columnar quantum dots (CQDs) with different numbers of superlattice periods were fabricated and tested. The polarization dependence of the electroluminescence(EL) and absorption of such CQDs structures were measured. Compared to standard QDs a large improvement in the ratio of transverse-magnetic (TM) and -electric (TE) integrated EL was obtained in CQDs, depending on the number of stacked GaAs / InAs superlattice periods, which can be attributed to the more symmetric shape of CQDs. TM and TE resolved photovoltage absorption spectroscopy confirmed this improvement. A small spectral separation between TE- and TM-EL peaks has been observed showing that heavy and light holelike states are energetically close in these QDs.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Additional Information: Pdf uploaded in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/0003-6951/ (accessed 20/02/2014).
Publisher: American Institute of Physics
ISSN: 0003-6951
Date of First Compliant Deposit: 30 March 2016
Last Modified: 04 Jun 2017 05:45
URI: http://orca.cf.ac.uk/id/eprint/53208

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