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Optical emission from a charge-tunable quantum ring

Author

Listed:
  • R. J. Warburton

    (Center for NanoScience and Sektion Physik, Ludwig-Maximilians-Universität
    Heriot-Watt University)

  • C. Schäflein

    (Center for NanoScience and Sektion Physik, Ludwig-Maximilians-Universität)

  • D. Haft

    (Center for NanoScience and Sektion Physik, Ludwig-Maximilians-Universität)

  • F. Bickel

    (Center for NanoScience and Sektion Physik, Ludwig-Maximilians-Universität)

  • A. Lorke

    (Center for NanoScience and Sektion Physik, Ludwig-Maximilians-Universität)

  • K. Karrai

    (Center for NanoScience and Sektion Physik, Ludwig-Maximilians-Universität)

  • J. M. Garcia

    (University of California)

  • W. Schoenfeld

    (University of California)

  • P. M. Petroff

Abstract

Quantum dots or rings are artificial nanometre-sized clusters that confine electrons in all three directions. They can be fabricated in a semiconductor system by embedding an island of low-bandgap material in a sea of material with a higher bandgap. Quantum dots are often referred to as artificial atoms because, when filled sequentially with electrons, the charging energies are pronounced for particular electron numbers1,2,3; this is analogous to Hund's rules in atomic physics. But semiconductors also have a valence band with strong optical transitions to the conduction band. These transitions are the basis for the application of quantum dots as laser emitters4, storage devices5,6,7 and fluorescence markers8. Here we report how the optical emission (photoluminescence) of a single quantum ring changes as electrons are added one-by-one. We find that the emission energy changes abruptly whenever an electron is added to the artificial atom, and that the sizes of the jumps reveal a shell structure.

Suggested Citation

  • R. J. Warburton & C. Schäflein & D. Haft & F. Bickel & A. Lorke & K. Karrai & J. M. Garcia & W. Schoenfeld & P. M. Petroff, 2000. "Optical emission from a charge-tunable quantum ring," Nature, Nature, vol. 405(6789), pages 926-929, June.
    • Handle: RePEc:nat:nature:v:405:y:2000:i:6789:d:10.1038_35016030
    DOI: 10.1038/35016030
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    Cited by:

    1. Luca Sortino & Panaiot G. Zotev & Catherine L. Phillips & Alistair J. Brash & Javier Cambiasso & Elena Marensi & A. Mark Fox & Stefan A. Maier & Riccardo Sapienza & Alexander I. Tartakovskii, 2021. "Bright single photon emitters with enhanced quantum efficiency in a two-dimensional semiconductor coupled with dielectric nano-antennas," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    2. Peter Millington-Hotze & Harry E. Dyte & Santanu Manna & Saimon F. Covre da Silva & Armando Rastelli & Evgeny A. Chekhovich, 2024. "Approaching a fully-polarized state of nuclear spins in a solid," Nature Communications, Nature, vol. 15(1), pages 1-7, December.

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