Biexciton initialization by two-photon excitation in site-controlled quantum dots: The complexity of the antibinding state case

@article{Juska2020BiexcitonIB,
  title={Biexciton initialization by two-photon excitation in site-controlled quantum dots: The complexity of the antibinding state case},
  author={Gediminas Juska and Iman Ranjbar Jahromi and Francesco Mattana and Simone Varo and Valeria Dimastrodonato and Emanuele Pelucchi},
  journal={Applied Physics Letters},
  year={2020},
  volume={117},
  pages={134001}
}
In this work, we present a biexciton state population in (111)B oriented site-controlled InGaAs quantum dots (QDs) by resonant two photon excitation. We show that the excited state recombines emitting highly pure single photon pairs entangled in polarization. The discussed cases herein are compelling due to the specific energetic structure of pyramidal InGaAs QDs—an antibinding biexciton—a state with a positive binding energy. We demonstrate that resonant two-photon excitation of QDs with… 
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