Ultrafast conditional carrier dynamics in semiconductor quantum dots

Paola Borri; Wolfgang Langbein

doi:10.1117/12.873835

21 February 2011 Ultrafast conditional carrier dynamics in semiconductor quantum dots

Paola Borri, Wolfgang Langbein

Proceedings Volume 7937, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XV; 793704 (2011) https://doi.org/10.1117/12.873835
Event: SPIE OPTO, 2011, San Francisco, California, United States

Abstract

We provide direct evidence that the macroscopic response of the gain dynamics in electrically-pumped In- GaAs/GaAs quantum dots is a superposition of intradot relaxation dynamics from microstates with multiple discrete carrier numbers. The gain recovery in the presence of an optical pre-pump fully depleting the ground-state gain is measured to be faster than without pre-pump. This effect, opposite to expectations from rate equations with mean-field carrier distributions, is due to a conditional gain recovery in which microstates with slow internal dynamics are suppressed by the pre-pump. The effect is evident at 15K and still observable at 300 K, beneficial for high-speed optical signal processing.

Citation Download Citation

Paola Borri and Wolfgang Langbein "Ultrafast conditional carrier dynamics in semiconductor quantum dots", Proc. SPIE 7937, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XV, 793704 (21 February 2011); https://doi.org/10.1117/12.873835

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