Charged excitons in quantum dots: Novel magnetic behavior and Auger processes

A. O. Govorov, K. Karrai, R. J. Warburton, A. V. Kalameitsev

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We describe theoretically multiply-charged excitons interacting with a continuum of delocalized states. Such excitons exist in relatively shallow quantum dots and have been observed in recent optical experiments on InAs self-assembled dots. The interaction of an exciton and delocalized states occurs via Auger-like processes. To describe the optical spectra, we employ the Anderson-like Hamiltonian by including the interaction between the localized exciton and delocalized states of the wetting layer. In the absence of a magnetic field, the photoluminescence line shapes exhibit interference effects. When a magnetic field is applied, the photoluminescence spectrum demonstrates anticrossings with the Landau levels of the extended states. We show that the magnetic-field behavior of charged excitons is very different to that of diamagnetic excitons in three and two-dimensional systems. © 2003 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)295-299
Number of pages5
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume20
Issue number3-4
DOIs
Publication statusPublished - Jan 2004
EventProceedings of the 11th International Conference on Narrow Gap - Buffalo, NY., United States
Duration: 16 Jun 200320 Jun 2003

Keywords

  • Exciton
  • Magnetic field
  • Quantum dot

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