Enhancement of spin polarization in asymmetrically coupled CdSe and CdZnMnSe quantum dots in ZnSe matrix

Sang Hoon Lee, M. Dobrowolska, J. K. Furdyna

Research output: Contribution to journalArticle

Abstract

An asymmetrically coupled double quantum dot (QD) system consisting of adjacent CdSe and CdZnMnSe QD layers in a ZnSe matrix was investigated using polarization-selective magneto-photoluminescence (PL). Two well-resolved PL peaks are observed corresponding, respectively, to the CdSe and the CdZnMnSe QDs. The peaks exhibit significant change in the intensity and energy position when a magnetic field is applied. The enhancement of the degree of σ- circular polarization emitted by the non-magnetic CdSe QDs is observed in the double layer system, as compared to that observed in CdSe QDs without the influence of neighboring CdZnMnSe QDs. This behavior was discussed in terms of antiferromagnetic interaction between carrier spins localized in pairs of CdSe and CdZnMnSe QDs that are electronically coupled.

Original languageEnglish
Pages (from-to)367-370
Number of pages4
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume32
Issue number1-2 SPEC. ISS.
DOIs
Publication statusPublished - 2006 May 1

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Spin polarization
Semiconductor quantum dots
Photoluminescence
quantum dots
photoluminescence
Circular polarization
augmentation
polarization
circular polarization
matrices
Polarization
Magnetic fields
magnetic fields
interactions
energy

Keywords

  • Magnetic semiconductor
  • Quantum dots
  • Spin polarization

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Enhancement of spin polarization in asymmetrically coupled CdSe and CdZnMnSe quantum dots in ZnSe matrix. / Lee, Sang Hoon; Dobrowolska, M.; Furdyna, J. K.

In: Physica E: Low-Dimensional Systems and Nanostructures, Vol. 32, No. 1-2 SPEC. ISS., 01.05.2006, p. 367-370.

Research output: Contribution to journalArticle

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