Selective optical pumping of charged excitons in unintentionally doped InAs quantum dots

Guillermo Munoz-Matutano*, Benito Alen, Juan Martinez-Pastor, Lucca Seravalli, Paola Frigeri, Secondo Franchi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

We have investigated the selective optical pumping of charged excitonic species in a sample containing quantum dots of different sizes and low areal density by photoluminescence and excitation of the photoluminescence microspectroscopy. We study the selective optical excitation of negatively charged excitons as an alternative to commonly used electrical methods. We demonstrate that under resonant excitation in impurity related bands, the selective pumping efficiency can be as high as 85% in small quantum dots having one electron shell and emitting at around 930 nm, and around 65% in big quantum dots having four electron shells and emitting at 1160 nm.

Original languageEnglish
Article number145711
Number of pages6
JournalNanotechnology
Volume19
Issue number14
DOIs
Publication statusPublished - 9 Apr 2008
Externally publishedYes

Keywords

  • GROWTH
  • PHOTOLUMINESCENCE
  • EMISSION
  • SPIN

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