Quantum Dots

Spectral Energy Tuning

Quantum Dots in Quantum Wells Selective Overgrowth and Wavelength Tuning Muhammad Usman, Gerhard Klimeck


  • Optical emission at 1.5um without GaN?
  • Understand experimental data on QD spectra in selective overgrowth


  • Model large, realistic structure 60nm x 60nm x 60nm => 15 million atoms
  • No changes to the published tight binding parameters


  • Match experiment remarkably well
  • Strain is of critical imprtance
  • Change in quantum dot aspect ratio - quantum dot changes shape!


  • Quantitative model of complex system
  • nano-TCAD for Quantum Dots!


  • Accepted in IEEE Trans. Nanotechn.

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