Long lived coherence in self-assembled quantum dots

Dan Birkedal, Kristjan Leosson, Jørn Märcher Hvam

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Abstract

We report measurements of ultralong coherence in self-assembled quantum dots. Transient four-wave mixing experiments at 5 K show an average dephasing time of 372 ps, corresponding to a homogeneous linewidth of 3.5 mu eV, which is significantly smaller than the linewidth observed in single-dot luminescence. Time-resolved luminescence measurements show a lifetime of the dot ground state of 800 ps, demonstrating the presence of pure dephasing at finite temperature. The homogeneous width is lifetime limited only at temperatures approaching 0 K.
Original languageEnglish
JournalPhysical Review Letters
Volume87
Issue number22
Pages (from-to)227401
ISSN0031-9007
DOIs
Publication statusPublished - 2001

Bibliographical note

Copyright (2001) American Physical Society

Keywords

  • SPECTROSCOPY
  • WELLS
  • COMPUTATION
  • PHONON INTERACTIONS
  • SPECTRAL DIFFUSION
  • MICROSCOPIC PHOTOLUMINESCENCE
  • TEMPERATURE

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