Polarization and excitation power-dependent photoluminescence of magnetic/non-magnetic coupled quantum dots

S. Lee, M. Dobrowolska, J. K. Furdyna

Research output: Contribution to journalArticle

Abstract

The magneto-photoluminescence experiments have been performed on a coupled quantum dots (QDs) system composed of CdSe and CdMnSe QD double layers. The photoluminescence peaks from two QD layers forms a wide PL band due to the inhomogeneous broadening of QD ensemble in the coupled QD system. The intensity of the PL band undergoes significant change when a magnetic field is applied. Specifically, the QD system shows large difference in intensity between σ- and σ+ circular polarizations, which results from the spin polarization of carriers in the presence of magnetic field. Interestingly, while the lower energy side of the PL band was dominated by the σ+ circular polarization, the higher energy side of the band was dominated by the σ- circular polarization. Furthermore, the relative PL intensity at the low energy side of the band remarkably increases with decrease in excitation power for the σ+ circular polarization, while it showed no significant change for σ- circular polarization. Such polarization and excitation power-dependent behaviors of PL intensity enable us to identify the relative potential profile of the magnetic/non-magnetic coupled QD systems.

Original languageEnglish
Pages (from-to)851-854
Number of pages4
JournalJournal of Crystal Growth
Volume311
Issue number3
DOIs
Publication statusPublished - 2009 Jan 15

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Keywords

  • A. Magnetic semiconductor
  • A. Quantum dot
  • E. Polarization

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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