Role of Coulomb correlations for femtosecond pump-probe signals obtained from a single quantum dot
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We present a theoretical analysis of femtosecond pump-probe experiments performed on a single negatively charged quantum dot. The influence of Coulomb-correlation effects as well as carrier relaxation on transient transmission change signals is investigated. Our model describes ultrafast disappearance of the fundamental trion absorption due to instantaneous Coulomb renormalizations and a delayed onset of gain at the same frequency, as found in the measurements. Going beyond previous experimental information, we predict that after spin-conserving carrier relaxation, new optical transitions exhibiting either gain or absorption should emerge that build up on a picosecond timescale. The time dependence of these new transitions provides insight into details of the carrier relaxation processes.
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HUNEKE, Jan, Irene D'AMICO, Paweł MACHNIKOWSKI, Tim THOMAY, Rudolf BRATSCHITSCH, Alfred LEITENSTORFER, Tilmann KUHN, 2011. Role of Coulomb correlations for femtosecond pump-probe signals obtained from a single quantum dot. In: Physical Review B. 2011, 84(11). ISSN 1098-0121. eISSN 1550-235X. Available under: doi: 10.1103/PhysRevB.84.115320BibTex
@article{Huneke2011Coulo-19187, year={2011}, doi={10.1103/PhysRevB.84.115320}, title={Role of Coulomb correlations for femtosecond pump-probe signals obtained from a single quantum dot}, number={11}, volume={84}, issn={1098-0121}, journal={Physical Review B}, author={Huneke, Jan and D'Amico, Irene and Machnikowski, Paweł and Thomay, Tim and Bratschitsch, Rudolf and Leitenstorfer, Alfred and Kuhn, Tilmann} }
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