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      Tracking Dark Excitons with Exciton Polaritons in Semiconductor Microcavities.

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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.

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          Author and article information

          Journal
          Phys Rev Lett
          Physical review letters
          American Physical Society (APS)
          1079-7114
          0031-9007
          Feb 01 2019
          : 122
          : 4
          Affiliations
          [1 ] Experimentelle Physik 2, Technische Universität Dortmund, D-44221 Dortmund, Germany.
          [2 ] A. F. Ioffe Physical-Technical Institute, Russian Academy of Sciences, St. Petersburg 194021, Russia.
          [3 ] Technische Physik, Universität Würzburg, 97074 Würzburg, Germany.
          [4 ] SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, United Kingdom.
          [5 ] School of Physics and Astronomy, University of Southampton, SO17 1NJ Southampton, United Kingdom.
          [6 ] Vladimir State University named after A. G. and N. G. Stoletovs, Gorky Street 87, 600000, Vladimir, Russia.
          [7 ] Spin Optics Laboratory, St. Petersburg State University, Ulanovskaya 1, Peterhof, St. Petersburg 198504, Russia.
          [8 ] International Center for Polaritonics, Westlake University, No. 18, Shilongshan Road, Cloud Town, Xihu District, Hangzhou, China.
          Article
          10.1103/PhysRevLett.122.047403
          30768323
          0865bf81-64a8-4fb5-ad02-ca1842e8c12b
          History

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