Quantum Dots

Spectral Energy Tuning

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

Objective:

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

Approach:

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

Results:

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

Impact:

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

Publications:

  • Accepted in IEEE Trans. Nanotechn.


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Quantum Dots

Quantum Dots Home Fine Structure Splitting Spectral Energy Tuning What is a Quantum Dot? Beyond SIA Roadmap Concept Implementations Experimental Examples Optical Detectors Logic/Memory 7th Order Isosurface Movie 1st-8th Order Isosurface Movie Zincblende Isosurface Movie