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Physical Sciences and Mathematics | Physics

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This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in T. Piwonski et al., Appl. Phys. Lett. 90, 122108 (2007) and may be found at

The authors would like to acknowledge Christopher Roche and John Lucy for technical assistance. This study has been supported by Science Foundation Ireland (SFI) under Contract Nos. 01/FI/CO13 and 03/IN.1/1340, the Irish Research Council for Science, Engineering and Technology (IRCSET), through the Tyndall National Access Programme, and the Irish Higher Education Authority under the PRTLI program.


Carrier dynamics of a 1.3μm InAs∕GaAs quantum dot amplifier is studied using heterodyne pump-probe spectroscopy. Measurements of the recovery times versus injection current reveal a power law behavior predicted by a quantum dot rate equation model. These results indicate that Auger processes dominate the carrier dynamics.

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