Enhanced Probabilities of Phonon-Assisted Optical Transitions in Semiconductor Quantum Dots

Abstract

A theory of phonon-assisted optical transitions in semiconductor quantum dots is developed which takes into account non-adiabaticity of the exciton-phonon system. The role of non-adiabaticity is shown to be of paramount importance in spherical quantum dots where the lowest one-exciton state can be degenerate or quasi-degenerate. In quantum dots of lower symmetry the effects of non-adiabaticity reveal themselves mainly due to the phonon-induced mixing of states which belong to different energy levels. Our approach is applied to explain the optical spectra of several quantum-dot structures: ensembles of spherical CdSe, CdSe(x) S(1 - x) and PbS quantum dots self-assembled InAs/ GaAs and CdSe/ZnSe quantum dots brick-shaped InAs GaAs quantum dots.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 2001
Accession Number
ADP013290

Entities

People

  • J. T. Devreese

Organizations

  • Eindhoven University of Technology

Tags

Communities of Interest

  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Absorption
  • Absorption Spectra
  • Bulk Materials
  • Crystal Lattice Vibrations
  • Electrons
  • Excitons
  • Experimental Data
  • Intensity
  • Nanostructures
  • Optical Properties
  • Phonons
  • Photoluminescence
  • Quantum Dots
  • Raman Scattering
  • Raman Spectra
  • Scattering
  • Spectra

Readers

  • Materials Science and Engineering.
  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.

Technology Areas

  • Microelectronics
  • Quantum Computing