Trion, biexciton, and exciton dynamics in single self-assembled CdSe quantum dots

B Patton, W Langbein, U Woggon

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175 Citations (Scopus)

Abstract

We present an analysis of time- and polarization-resolved data taken in microphotoluminescence experiments on individual CdSe/ZnSe quantum dots grown by molecular beam epitaxy. The identification of individual dots was performed by a spectral jitter correlation technique and by their polarization properties and density dependences. Decay times are given for exciton, trion, and biexciton states and evidence is shown for a spin-relaxation-limited energy relaxation of the trion. For the bright-exciton state the temperature dependence of the decay time is studied and a repopulation from the dark-exciton state is observed. Trion binding energies of 15–22 meV and biexciton binding energies of 19–26 meV are found.
Original languageEnglish
Article number125316
Number of pages9
JournalPhysical Review B
Volume68
Issue number12
DOIs
Publication statusPublished - 18 Sep 2003

Keywords

  • polarization-resolved data
  • microphotoluminescence
  • quantum dots
  • molecular beam epitaxy
  • spectral jitter correlation technique
  • polarization properties
  • density dependences
  • dark-exciton state
  • trion binding
  • biexciton binding

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