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Electric control of the exciton fine structure in nonparabolic quantum dots

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2012

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http://nbn-resolving.de/urn:nbn:de:bsz:352-227195
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https://doi.org/10.1103/PhysRevB.86.165312
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Physical Review B. 2012, 86(16). ISSN 1098-0121. eISSN 1550-235X. Available under: doi: 10.1103/PhysRevB.86.165312

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We show that the nonparabolic confinement potential is responsible for the nonmonotonic behavior and sign change of the exciton fine-structure splitting (FSS) in optically active self-assembled quantum dots. This insight is important for the theoretical understanding and practical control by electric fields of the quantum state of the emitted light from a biexciton cascade recombination process. We find that a hard-wall (box) confinement potential leads to a FSS that is in better agreement with experimentally measured FSS than a harmonic potential. We then show that a finite applied electric field can be used to remove the FSS entirely, thus allowing for the creation of maximally entangled photons, being vital to the growing field of quantum communication and quantum key distribution.

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ISO 690WELANDER, Erik, Guido BURKARD, 2012. Electric control of the exciton fine structure in nonparabolic quantum dots. In: Physical Review B. 2012, 86(16). ISSN 1098-0121. eISSN 1550-235X. Available under: doi: 10.1103/PhysRevB.86.165312
BibTex
@article{Welander2012Elect-22719,
  year={2012},
  doi={10.1103/PhysRevB.86.165312},
  title={Electric control of the exciton fine structure in nonparabolic quantum dots},
  number={16},
  volume={86},
  issn={1098-0121},
  journal={Physical Review B},
  author={Welander, Erik and Burkard, Guido}
}
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