Optical transitions in quantum ring complexes

By T. Kuroda, Takashi Kuroda, T. Mano, T. Ochiai, S. Sanguinetti, Stefano Sanguinetti, K. Sakoda, G. Kido, N. Koguchi. 2005

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High Magnetic Field Center, National Institute for Materials Science, Sakura 3-13, Tsukuba 305-0003, Japan(Dated: February 2, 2008)Making use of a droplet-epitaxial technique, we realize nanometer-sized quantum ring complexes, consistingof a well-defined inner ring and an outer ring. Electronic structure inherent in the unique quantum system isanalyzed using a micro-photoluminescence technique. One advantage of our growth method is that it presentsthe possibility of varying the ring geometry. Two samples are prepared and studied: a single-wall ring and aconcentric double-ring. For both samples, highly efficient photoluminescence emitted from a single quantumstructure 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 theouter ring are identified distinctly as split lines. The obse rved spectra are interpreted on the basis of singleelectron effective mass calculations.

Subfields: Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/9175ac6f29d2c923561092699d161e130887dec3