Dynamics of excitons in individual InAs quantum dots revealed in four-wave mixing spectroscopy
Abstract
A detailed understanding of the population and coherence dynamics in optically driven individual emitters in solids and their signatures in ultrafast nonlinear-optical signals is of prime importance for their applications in future quantum and optical technologies. In a combined experimental and theoretical study on exciton complexes in single semiconductor quantum dots we reveal a detailed picture of the dynamics employing three-beam polarization-resolved four-wave mixing (FWM) micro-spectroscopy. The oscillatory dynamics of the FWM signals in the exciton-biexciton system is governed by the fine-structure splitting and the biexciton binding energy in an excellent quantitative agreement between measurement and analytical description. The analysis of the excitation conditions exhibits a dependence of the dynamics on the specific choice of polarization configuration, pulse areas and temporal ordering of driving fields. The interplay between the transitions in the four-level exciton system leads to rich evolution of coherence and population. Using two-dimensional FWM spectroscopy we elucidate the exciton-biexciton coupling and identify neutral and charged exciton complexes in a single quantum dot. Our investigations thus clearly reveal that FWM spectroscopy is a powerful tool to characterize spectral and dynamical properties of single quantum structures.
Citation
Mermillod , Q , Wigger , D , Delmonte , V , Reiter , D E , Schneider , C , Kamp , M , Höfling , S , Langbein , W , Kuhn , T , Nogues , G & Kasprzak , J 2016 , ' Dynamics of excitons in individual InAs quantum dots revealed in four-wave mixing spectroscopy ' , Optica , vol. 3 , no. 4 , pp. 377-384 . https://doi.org/10.1364/OPTICA.3.000377
Publication
Optica
Status
Peer reviewed
ISSN
2334-2536Type
Journal article
Rights
© 2016 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at www.osapublishing.org https://dx.doi.org/10.1364/OPTICA.3.000377
Description
We acknowledge the support by the ERC Starting Grant PICSEN, contract no. 306387. D.E.R. is grateful for financial support from the DAAD within the P.R.I.M.E. program.Collections
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