Nonequilibrium carrier dynamics in self-assembled InGaAs/GaAs quantum dots

Markus Wesseli; Claudia Ruppert; Stephan Trumm; Markus Betz

doi:10.1117/12.695522

8 February 2007 Nonequilibrium carrier dynamics in self-assembled InGaAs/GaAs quantum dots

Markus Wesseli, Claudia Ruppert, Stephan Trumm, Markus Betz

Proceedings Volume 6471, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XI and Semiconductor Photodetectors IV; 647102 (2007) https://doi.org/10.1117/12.695522
Event: Integrated Optoelectronic Devices 2007, 2007, San Jose, California, United States

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.

Citation Download Citation

Markus Wesseli, Claudia Ruppert, Stephan Trumm, and Markus Betz "Nonequilibrium carrier dynamics in self-assembled InGaAs/GaAs quantum dots", Proc. SPIE 6471, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XI and Semiconductor Photodetectors IV, 647102 (8 February 2007); https://doi.org/10.1117/12.695522

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