Many-body effects in quantum-dot lasers

Hans Christian Schneider, Weng W. Chow, Peter M. Smowton, Emma J. Pèarce, Stephan W. Koch

Research output: Contribution to journalConference articlepeer-review


We investigate the influence of the coupling between localized and continuum states on the optical gain and refractive index in self-organized quantum-dot structures under high-excitation conditions. For wide-bandgap nitride-based quantum-dot structures we show that the presence of strong many-body Coulomb interactions and the quantum-confined Stark effect result in absorption/gain features that depend on the quantum-dot dimensions in a nontrivial way. For InAs/GaAs based quantum dots, we investigate the refractive index properties and show that negative α. or linewidth enhancement factors may occur in these systems, which makes the beam quality (filamentation) properties of quantum-dot lasers very different from quantum-well lasers. This is consistent with measurements which show a reduction in quantum-dot laser filamentation as the injection level is increased.

Original languageEnglish (US)
Pages (from-to)29-35
Number of pages7
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - Dec 1 2003
EventPROCEEDINGS OF SPIE SPIE - The International Society for Optical Engineering: Physics and Simulation of Optoelectronic Devices XI - San Jose, CA, United States
Duration: Jan 27 2003Jan 31 2003


  • Light propagation
  • Linewidth-enhancement factor
  • Quantum dots
  • Semiconductor lasers

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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