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Coulomb binding of electrons to multiply charged GaSb/GaAs self-assembled quantum dots

Research output: Contribution to journalJournal article

Published

  • M Hayne
  • J Maes
  • S Bersier
  • A Schliwa
  • L Muller-Kirsch
  • C Kapteyn
  • R Heitz
  • D Bimberg
  • V V Moshchalkov
Journal publication date03/2004
JournalPhysica E: Low-dimensional Systems and Nanostructures
Journal number2-4
Volume21
Number of pages4
Pages189-192
Original languageEnglish

Abstract

We explore the Coulomb binding of electrons to holes confined to type-II GaSb self-assembled quantum dots. We demonstrate that at low laser power electrons are more weakly bound to holes trapped by the dots than to holes in the wetting layer. On the other hand, at high laser power the hydrogenic binding energy of dot excitons increases by more than a factor of two, and so exceeds that of wetting layer excitons. We attribute this to the strong binding of 'core' electrons to dots that are highly charged with holes by optical pumping. (C) 2003 Elsevier B.V. All rights reserved.