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Proceedings Paper

Nonequilibrium carrier dynamics in self-assembled InGaAs/GaAs quantum dots
Author(s): Markus Wesseli; Claudia Ruppert; Stephan Trumm; Markus Betz
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Paper Abstract

Carrier dynamics in InGaAs/GaAs quantum dots is analyzed with highly sensitive femtosecond transmission spectroscopy. In a first step, measurements on a large ensemble of nanoislands reveal the dynamical electronic filling of quantum dots from the surrounding wetting layer. Most interestingly, we find a spin-preserving phonon mediated scattering into fully localized states within a few picoseconds. Then, individual artificial atoms are isolated with metallic shadow masks. For the first time, a single self-assembled quantum dot is addressed in an ultrafast transmission experiment. We find bleaching signals in the order of 10-5 that arise from individual interband transitions of one quantum dot. As a result, we have developed an ultrafast optical tool for both manipulation and read-out of a single self-assembled quantum dot.

Paper Details

Date Published: 8 February 2007
PDF: 8 pages
Proc. SPIE 6471, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XI and Semiconductor Photodetectors IV, 647102 (8 February 2007); doi: 10.1117/12.695522
Show Author Affiliations
Markus Wesseli, Technische Univ. München (Germany)
Claudia Ruppert, Technische Univ. München (Germany)
Stephan Trumm, Technische Univ. München (Germany)
Markus Betz, Technische Univ. München (Germany)
Univ. of Toronto (Canada)


Published in SPIE Proceedings Vol. 6471:
Ultrafast Phenomena in Semiconductors and Nanostructure Materials XI and Semiconductor Photodetectors IV
Marshall J. Cohen; Joseph P. Estrera; Kong-Thon Tsen; Jin-Joo Song, Editor(s)

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