12,000

We have over 12,000 students, from over 100 countries, within one of the safest campuses in the UK

93%

93% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > Increase of charge-carrier redistribution effic...
View graph of relations

« Back

Increase of charge-carrier redistribution efficiency in a laterally organized superlattice of coupled quantum dots

Research output: Contribution to journalJournal article

Published

  • Charles Cornet
  • M. Hayne
  • P. Caroff
  • Christophe Levallois
  • L. Joulaud
  • E. Homeyer
  • Cyril Paranthoen
  • Jacky Even
  • C. Labbe
  • Hervé Folliot
  • Victor V. Moshchalkov
  • Silmane Loualiche
???articleNumber???245315
Journal publication date18/12/2006
JournalPhysical Review B
Journal number24
Volume74
Number of pages10
Pages-
Original languageEnglish

Abstract

We report the observation of enhanced charge-carrier redistribution in laterally organized and coupled InAs/InP quantum dots (QDs). We show that a periodic organization appears in the QD plane for a high in-plane QD density (QDD). This organization enhances the lateral coupling between the dots, which is evidenced by photoluminescence and magnetophotoluminescence experiments. Electronic inter-QD lateral coupling results in an improved charge-carrier distribution at low temperature, as shown by electroluminescence on high QDD QD lasers. We conclude that the inter-QD tunneling occurs via the tunneling of excited states through the wetting layer, and discuss the prospects of using coupled QDs for improving the quantum efficiency and dynamical properties of QD lasers.