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Increase of charge-carrier redistribution efficiency in a laterally organized superlattice of coupled quantum dots

Cornet, Charles and Hayne, M. and Caroff, P. and Levallois, Christophe and Joulaud, L. and Homeyer, E. and Paranthoen, Cyril and Even, Jacky and Labbe, C. and Folliot, Hervé and Moshchalkov, Victor V. and Loualiche, Silmane (2006) Increase of charge-carrier redistribution efficiency in a laterally organized superlattice of coupled quantum dots. Physical Review B, 74 (24). -. ISSN 1550-235X

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    Abstract

    We report the observation of enhanced charge-carrier redistribution in laterally organized and coupled InAs/InP quantum dots (QDs). We show that a periodic organization appears in the QD plane for a high in-plane QD density (QDD). This organization enhances the lateral coupling between the dots, which is evidenced by photoluminescence and magnetophotoluminescence experiments. Electronic inter-QD lateral coupling results in an improved charge-carrier distribution at low temperature, as shown by electroluminescence on high QDD QD lasers. We conclude that the inter-QD tunneling occurs via the tunneling of excited states through the wetting layer, and discuss the prospects of using coupled QDs for improving the quantum efficiency and dynamical properties of QD lasers.

    Item Type: Article
    Journal or Publication Title: Physical Review B
    Uncontrolled Keywords: 1.55 MU-M ; OPTICAL-PROPERTIES ; MAGNETOPHOTOLUMINESCENCE ; ENSEMBLES ; ISLANDS ; GROWTH
    Subjects: UNSPECIFIED
    Departments: Faculty of Science and Technology > Physics
    ID Code: 49478
    Deposited By: ep_importer_pure
    Deposited On: 23 Aug 2011 16:43
    Refereed?: Yes
    Published?: Published
    Last Modified: 26 Jul 2012 19:28
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/49478

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