Coulomb effect inhibiting spontaneous emission in charged quantum dot

Gradkowski, Kamil; Ochalski, Tomasz J.; Pavarelli, Nicola; Williams, David P.; Huyet, Guillaume; Liang, Baolai; Huffaker, Diana L.
August 2010
Applied Physics Letters;8/30/2010, Vol. 97 Issue 9, p091105
Academic Journal
We investigate the emission dynamics of InAs/GaAs quantum dots (QDs) coupled to an InGaAs quantum well in a tunnel injection scheme by means of time-resolved photoluminescence. Under high-power excitation we observe a redshift in the QD emission of the order of 20 meV. The optical transition intensity shows a complex evolution, where an initial plateau phase is followed by an increase in intensity before a single-exponential decay. We attribute this behavior to the Coulomb interactions between the carriers in a charged QD and corroborate the experimental results with both a rate equation model and self-consistent eight-band k·p calculations.


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