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Magneto-optical study of thermally annealed InAs-InGaAs-GaAs self-assembled quantum dots

Nabavi, E., Badcock, T.J., Nuytten, T., Liu, H.Y., Hopkinson, M., Moshchalkov, V.V. and Mowbray, D.J. (2009) Magneto-optical study of thermally annealed InAs-InGaAs-GaAs self-assembled quantum dots. Journal of Applied Physics, 105 (5). Art. No.053512. ISSN 0021-8979

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Abstract

We report a magneto-optical study of InAs-InGaAs-GaAs self-assembled quantum dots (QDs) subjected to post-growth thermal annealing at different temperatures. At low temperatures annealing strongly affects the bimodal distribution of QDs; at higher temperatures a strong blueshift of the emission occurs. Magnetophotoluminescence reveals that the annealing increases the QD size, with a larger effect occurring along the growth axis, and decreases the carrier effective masses. The main contribution to the blueshift is deduced to be an increase in the average Ga composition of the QDs. The inadvertent annealing which occurs during the growth of the upper AlGaAs cladding layer in laser structures is also studied.

Item Type: Article
Copyright, Publisher and Additional Information: © 2009 American Institute of Physics. This is an author produced version of a paper subsequently published in the Journal of Applied Physics. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: aluminium compounds; annealing; gallium arsenide; III-V semiconductors; indium compounds; magneto-optical effects; optical materials; photoluminescence; self-assembly; semiconductor lasers; semiconductor quantum dots; spectral line shift
Academic Units: The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield)
The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Electronic and Electrical Engineering (Sheffield)
Depositing User: Miss Anthea Tucker
Date Deposited: 06 Apr 2009 13:41
Last Modified: 08 Feb 2013 16:58
Published Version: http://dx.doi.org/10.1063/1.3082012
Status: Published
Publisher: American Institute of Physics
Refereed: Yes
Identification Number: 10.1063/1.3082012
URI: http://eprints.whiterose.ac.uk/id/eprint/8488

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