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Tracking dark excitons with exciton polaritons in semiconductor microcavities

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Schmidt_2019_Tracking_dark_PRL_AAM.pdf (793.8Kb)
Date
01/02/2019
Author
Schmidt, D.
Berger, B.
Kahlert, M.
Bayer, M.
Schneider, C.
Höfling, Sven
Sedov, E. S.
Kavokin, A. V.
Aßmann, M.
Keywords
QC Physics
TK Electrical engineering. Electronics Nuclear engineering
NDAS
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Abstract
Dark excitons are of fundamental importance for a wide variety of processes in semiconductors but are difficult to investigate using optical techniques due to their weak interaction with light fields. We reveal and characterize dark excitons nonresonantly injected into a semiconductor microcavity structure containing InGaAs/GaAs quantum wells by a gated train of eight 100 fs pulses separated by 13 ns by monitoring their interactions with the bright lower polariton mode. We find a surprisingly long dark exciton lifetime of more than 20 ns, which is longer than the time delay between two consecutive pulses. This creates a memory effect that we clearly observe through the variation of the time-resolved transmission signal. We propose a rate equation model that provides a quantitative agreement with the experimental data.
Citation
Schmidt , D , Berger , B , Kahlert , M , Bayer , M , Schneider , C , Höfling , S , Sedov , E S , Kavokin , A V & Aßmann , M 2019 , ' Tracking dark excitons with exciton polaritons in semiconductor microcavities ' , Physical Review Letters , vol. 122 , no. 4 , 047403 . https://doi.org/10.1103/PhysRevLett.122.047403
Publication
Physical Review Letters
Status
Peer reviewed
DOI
https://doi.org/10.1103/PhysRevLett.122.047403
ISSN
0031-9007
Type
Journal article
Rights
© 2019, American Physical Society. This work has been made available online in accordance with the publisher's policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1103/PhysRevLett.122.047403
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/16902

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