Excitonic light does not have to come from excitons

S. Chatterjee, C. Ell, S. Mosor, C. Khitrova, H. M. Gibbs, W. Hoyer, M. Kira, S. W. Koch, J. P. Prineas, H. Stolz

Research output: Contribution to specialist publicationArticle


The photoluminescence spectrum, along with the excitation-dependent absorption spectrum, at the exciton resonance at and above the bandgap were measured, following the above-bandgap picosecond excitation of very high quality InGaAs quantum wells. The spetra were taken over a wide range of carrier densities and lattice temperatures. The carrier temperature from the above-bandgap spectrum was obtained and carrier density from the reduction in exciton absorption was determined. The measured spectra were compared to spectra computed with a fully microscopic theory to determine whether the excitonic emission originate from the plasma or from an exciton population. Electron and hole in plasma come close together and emit a photon at the exciton resonance.

Original languageEnglish (US)
Number of pages1
Specialist publicationOptics and Photonics News
StatePublished - Dec 2004

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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