Charged magneto-exciton states in semiconductor quantum dots

R. J. Warburton, B. Urbaszek, E. J. McGhee, C. Schulhauser, A. Högele, K. Karrai, B. D. Gerardot, P. M. Petroff

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

By embedding a layer of self-assembled quantum dots into a field-effect structure, we are able to control the exciton charge in a single dot. We present the results of photoluminescence experiments as a function of both charge and magnetic field. The results demonstrate a hierarchy of energy scales determined by quantization, the direct Coulomb interaction, the electron-electron exchange interaction, and the electron-hole exchange interaction. For excitons up to the triply charged exciton, the behavior can be understood from a model assuming discrete levels within the quantum dot. For the triply charged exciton, this is no longer the case. In a magnetic field, we discover a coherent interaction with the continuum states, the Landau levels associated with the wetting layer. © 2004 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)45-50
Number of pages6
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume26
Issue number1-4
DOIs
Publication statusPublished - Feb 2005
EventInternational Conference on Quantum Dots - Banff, Alberta, Canada
Duration: 10 May 200413 May 2004

Keywords

  • Excitons
  • Landau level
  • Quantum dots

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