Optical transitions in quantum ring complexes

T. Kuroda, T. Mano, T. Ochiai, S. Sanguinetti, K. Sakoda, G. Kido, and N. Koguchi
Phys. Rev. B 72, 205301 – Published 2 November 2005

Abstract

Making use of a droplet-epitaxial technique, we realize nanometer-sized quantum ring complexes, consisting of a well-defined inner ring and an outer ring. Electronic structure inherent in the unique quantum system is analyzed using a microphotoluminescence technique. One advantage of our growth method is that it presents the possibility of varying the ring geometry. Two samples are prepared and studied: a single-wall ring and a concentric double ring. For both samples, highly efficient photoluminescence emitted from a single quantum structure is detected. The spectra show discrete resonance lines, which reflect the quantized nature of the ring-type electronic states. In the concentric double ring, the carrier confinement in the inner ring and that in the outer ring are identified distinctly as split lines. The observed spectra are interpreted on the basis of single electron effective mass calculations.

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  • Received 20 April 2005

DOI:https://doi.org/10.1103/PhysRevB.72.205301

©2005 American Physical Society

Authors & Affiliations

T. Kuroda1,2, T. Mano1, T. Ochiai1, S. Sanguinetti1,3, K. Sakoda1,4, G. Kido1,5, and N. Koguchi1

  • 1Nanomaterials Laboratory, National Institute for Materials Science, Namiki 1-1, Tsukuba 305-0044, Japan
  • 2PRESTO, Japan Science and Technology Agency, 4-1-8 Honcho Kawaguchi, Saitama, Japan
  • 3Dipartimento di Scienza dei Materiali, Universitá di Milano Bicocca, Via Cozzi 53, I-20125 Milano, Italy
  • 4Graduate School of Pure and Applied Science, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8577, Japan
  • 5High Magnetic Field Center, National Institute for Materials Science, Sakura 3-13, Tsukuba 305-0003, Japan

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Issue

Vol. 72, Iss. 20 — 15 November 2005

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