Carrier dynamics in individual concentric quantum rings: Photoluminescence measurements

S. Sanguinetti, M. Abbarchi, A. Vinattieri, M. Zamfirescu, M. Gurioli, T. Mano, T. Kuroda, and N. Koguchi
Phys. Rev. B 77, 125404 – Published 7 March 2008

Abstract

We present a detailed analysis of the emission of individual GaAsAlGaAs concentric quantum rings. Time resolved and excitation power density dependence of the photoluminescence has been used in order to determine the carrier dynamics in concentric quantum rings. Despite the small spatial separation between the two rings of the concentric quantum ring complex, the exciton dynamics in the two rings is completely decoupled. A significant increase in the emission width and rise time, with respect to the quantum dot case, characterize the emission of the rings. We attribute such phenomenology to the exciton center-of-mass localization induced by ring height fluctuations in quantum-wire-like fashion.

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  • Received 3 September 2007

DOI:https://doi.org/10.1103/PhysRevB.77.125404

©2008 American Physical Society

Authors & Affiliations

S. Sanguinetti

  • L-NESS and Dipartimento di Scienza dei Materiali, Universitá di Milano Bicocca, Via Cozzi 53, I-20125 Milano, Italy

M. Abbarchi, A. Vinattieri, M. Zamfirescu, and M. Gurioli

  • LENS and Dipartimento di Fisica, Universitá di Firenze, Via Sansone 1, I-50019 Sesto Fiorentino, Italy

T. Mano, T. Kuroda, and N. Koguchi*

  • National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan

  • *Present address: L-NESS and Dipartimento di Scienza dei Materiali, Universitá di Milano Bicocca, Via Cozzi 53, I-20125, Milano, Italy.

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Issue

Vol. 77, Iss. 12 — 15 March 2008

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