Size dependent exciton g-factor in self-assembled InAs/InP quantum dots.

ORAL

Abstract

We have studied the size dependence of the exciton g-factor in self-assembled InAs/InP quantum dots. Photoluminescence measurements on a large ensemble of these dots indicate a multimodal height distribution. Cross-sectional Scanning Tunneling Microscopy measurements have been performed and support the interpretation of the macro photoluminescence spectra. More than 160 individual quantum dots have systematically been investigated by analyzing single dot magnetoluminescence between 1200nm and 1600 nm. We demonstrate a strong dependence of the exciton g-factor on the height and diameter of the quantum dots, which eventually gives rise to a sign change of the g-factor. The observed correlation between exciton g-factor and the size of the dots is in good agreement with calculations. The results demonstrate that quantum dots emitting at 1.55 micrometer and showing no Zeeman splitting (g-factor = 0) can be constructed. This makes these does interesting for quantum information processing at optical telecommunication wavelengths.

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Authors

  • Paul Koenraad

    Eindhoven University of Technology

  • Niek Kleemans

    Eindhoven University of Technology

  • Joost van Bree

    Eindhoven University of Technology

  • Murat Bozkurt

    Eindhoven University of Technology

  • Andrei Silov

    Eindhoven University of Technology

  • Richard Notzel

    Eindhoven University of Technology

  • Craig Pryor

    Department of Physics and Astronomy, University of Iowa, Department of Physics and Astronomy,University of Iowa, Dept. of Physics, University of Iowa., University of Iowa, Dept. of Physics and Astronomy, University of Iowa

  • M. E. Flatt\'e

    Department of Physics and Astronomy, University of Iowa, Optical Science and Technology Center and Department of Physics and Astronomy, University of Iowa, Dept. of Physics, University of Iowa., University of Iowa, Department of Physics and Astronomy University of Iowa, OSTC and Department of Physics and Astronomy, University of Iowa, Dept. of Physics, University of Iowa, Iowa City, IA 52242