Hoon Ryu

Incorporation of Contact Block Reduction with atomisic full band model and verification of its basis-dependent efficiency criteria

Optical Transitions in Realistic Quantum Dots: Fluctiations with Size. Hoon Ryu, Muhammad Usman and Gerhard Klimeck

Objective:

  • Evaluate Inter-band optical transition in quantum dots.
  • Can we get a local-optimized optical device through geometrical engineering of QD?

Approach:

  • Modify Fermi's Golden rule for finite structures.
  • Compute the first momentum of light direction w.r.t. ground hole/electron WF. (WF overlap).
  • Compute inter-band transition rate of the self-assembled InAs/GaAs QD with followings:
    • Full spdsU Tight Binding (TB) band model.
    • Valence Force Field (VFF) model to compute strain and corresponding local polarization.

Results:

  • WF overlap acts a key factor to estimate inter-band transition rate.
  • QD can be locally optimizaed through size engineering.
  • Piezoelectricity doesn't necessarily reduce the transition rate, as known in general.

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Hoon Ryu's Pages

Biography Study of optical properties of self-assembled InAs/GaAs Quantum Dot system with realistic dimensions Incorporation of Contact Block Reduction with atomisic full band model and verification of its basis-dependent efficiency criteria

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