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Phys. Rev. Lett. 92, 127402 (2004) [4 pages]

Photoluminescence of Tetrahedral Quantum-Dot Quantum Wells

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Vladimir A. Fonoberov1,2, Evghenii P. Pokatilov1, Vladimir M. Fomin3,1,*, and Jozef T. Devreese3,*
1Laboratory of Physics of Multilayer Structures, Department of Theoretical Physics, State University of Moldova, A. Mateevici 60, MD-2009 Chişinău, Moldova
2Nano-Device Laboratory, Department of Electrical Engineering, University of California–Riverside, Riverside, California 92521-0425, USA
3Theoretische Fysica van de Vaste Stoffen, Departement Natuurkunde, Universiteit Antwerpen, Universiteitsplein 1, B-2610 Antwerpen, Belgium

Received 18 June 2003; published 24 March 2004

Taking into account the tetrahedral shape of a quantum-dot quantum well (QDQW) when describing excitonic states, phonon modes, and the exciton-phonon interaction in the structure, we obtain within a nonadiabatic approach a quantitative interpretation of the photoluminescence spectrum of a single CdS/HgS/CdS QDQW. We find that the exciton ground state in a tetrahedral QDQW is bright, in contrast to the dark ground state for a spherical QDQW. The position of the phonon peaks in the photoluminescence spectrum is attributed to interface optical phonons. We also show that the experimental value of the Huang-Rhys parameter can be obtained only within the nonadiabatic theory of phonon-assisted transitions.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.127402
DOI:
10.1103/PhysRevLett.92.127402
PACS:
78.67.Bf, 63.22.+m, 73.21.La

*Also at COBRA, TU Eindhoven, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.

 
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