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Proceedings Paper

Dephasing processes in InGaAs quantum dots and quantum-dot molecules
Author(s): Paola Borri; Wolfgang W. Langbein; S. Schneider; Ulrike Woggon; Markus Schwab; Manfred Bayer; Roman L. Sellin; Dongxun Ouyang; Dieter Bimberg; S. Fafard; Zbigniew R. Wasilewski; Pawel Hawrylak
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Paper Abstract

The dephasing time in semiconductor quantum dots and quantum-dot molecules is measured using a sensitive four-wave mixing heterodyne technique. We find a dephasing time of several hundred picoseconds at low temperature in the ground-state transition of strongly-confined InGaAs quantum dots, approaching the radiative-lifetime limit. Between 7 K and 100 K the polarization decay has two distinct components resulting in a non-Lorentzian lineshape with a zero-phonon line and a broad band from elastic exciton-acoustic phonon interactions. On a series of InAs/GaAs quantum-dot molecules having different interdot barrier thicknesses a systematic dependence of the dephasing dynamics on the barrier thickness is observed. The results show how the quantum mechanical coupling of the electronic wavefunctions in the molecules affects both the exciton radiative lifetime and the exciton-acoustic phonon interaction.

Paper Details

Date Published: 14 June 2004
PDF: 12 pages
Proc. SPIE 5361, Quantum Dots, Nanoparticles, and Nanoclusters, (14 June 2004); doi: 10.1117/12.531544
Show Author Affiliations
Paola Borri, Univ. Dortmund (Germany)
Wolfgang W. Langbein, Univ. Dortmund (Germany)
S. Schneider, Univ. Dortmund (Germany)
Ulrike Woggon, Univ. Dortmund (Germany)
Markus Schwab, Univ. Dortmund (Germany)
Manfred Bayer, Univ. Dortmund (Germany)
Roman L. Sellin, Technische Univ. Berlin (Germany)
Dongxun Ouyang, Technische Univ. Berlin (Germany)
Dieter Bimberg, Technische Univ. Berlin (Germany)
S. Fafard, National Research Council Canada (Canada)
Zbigniew R. Wasilewski, National Research Council Canada (Canada)
Pawel Hawrylak, National Research Council Canada (Canada)

Published in SPIE Proceedings Vol. 5361:
Quantum Dots, Nanoparticles, and Nanoclusters
Diana L. Huffaker; Pallab Bhattacharya, Editor(s)

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