Carrier relaxation processes in magnetic semiconductor quantum-dot systems

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

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The energy relaxation process of CdSe/ZnMnSe quantum dots (QDs) was investigated using polarization-selective magneto-photoluminescence (PL). Peaks from the Mn 2+ internal transition, the CdSe QDs, and the ZnMnSe barrier were observed in the system. The CdSe QD peak was relatively weak while the intensity of the Mn 2+ transition was strong in the spectrum taken at zero magnetic field. However, the peaks intensities changed significantly when a magnetic field was applied, and the situation became reversed (i.e., the CdSe QD peak become stronger than the peak due to the Mn 2+ internal transition, specifically for σ + polarization). The opposite intensity behavior was observed in the peak from the Mn 2+ ions and in the PL of the CdSe QDs and revealed that these two carrier capture centers competed with each other for carriers excited in the ZnMnSe barrier. The variation in the Mn 2+ internal transition with the magnetic field was well described by using a model developed under an angular momentum selection rule. This suggests that competition between the two energy transfer processes in the CdSe/ZnMnSe QD system is responsible for the observed PL intensity behavior.

Original languageEnglish
Pages (from-to)688-691
Number of pages4
JournalJournal of the Korean Physical Society
Volume47
Issue number4
Publication statusPublished - 2005 Oct 1

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quantum dots
photoluminescence
magnetic fields
polarization
angular momentum
energy transfer
ions
energy

Keywords

  • Diluted magnetic semiconductor (DMS)
  • Energy relaxation
  • Quantum dot

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Carrier relaxation processes in magnetic semiconductor quantum-dot systems. / Lee, Sang Hoon; Dobrowolska, M.; Furdyna, J. K.

In: Journal of the Korean Physical Society, Vol. 47, No. 4, 01.10.2005, p. 688-691.

Research output: Contribution to journalArticle

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abstract = "The energy relaxation process of CdSe/ZnMnSe quantum dots (QDs) was investigated using polarization-selective magneto-photoluminescence (PL). Peaks from the Mn 2+ internal transition, the CdSe QDs, and the ZnMnSe barrier were observed in the system. The CdSe QD peak was relatively weak while the intensity of the Mn 2+ transition was strong in the spectrum taken at zero magnetic field. However, the peaks intensities changed significantly when a magnetic field was applied, and the situation became reversed (i.e., the CdSe QD peak become stronger than the peak due to the Mn 2+ internal transition, specifically for σ + polarization). The opposite intensity behavior was observed in the peak from the Mn 2+ ions and in the PL of the CdSe QDs and revealed that these two carrier capture centers competed with each other for carriers excited in the ZnMnSe barrier. The variation in the Mn 2+ internal transition with the magnetic field was well described by using a model developed under an angular momentum selection rule. This suggests that competition between the two energy transfer processes in the CdSe/ZnMnSe QD system is responsible for the observed PL intensity behavior.",
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N2 - The energy relaxation process of CdSe/ZnMnSe quantum dots (QDs) was investigated using polarization-selective magneto-photoluminescence (PL). Peaks from the Mn 2+ internal transition, the CdSe QDs, and the ZnMnSe barrier were observed in the system. The CdSe QD peak was relatively weak while the intensity of the Mn 2+ transition was strong in the spectrum taken at zero magnetic field. However, the peaks intensities changed significantly when a magnetic field was applied, and the situation became reversed (i.e., the CdSe QD peak become stronger than the peak due to the Mn 2+ internal transition, specifically for σ + polarization). The opposite intensity behavior was observed in the peak from the Mn 2+ ions and in the PL of the CdSe QDs and revealed that these two carrier capture centers competed with each other for carriers excited in the ZnMnSe barrier. The variation in the Mn 2+ internal transition with the magnetic field was well described by using a model developed under an angular momentum selection rule. This suggests that competition between the two energy transfer processes in the CdSe/ZnMnSe QD system is responsible for the observed PL intensity behavior.

AB - The energy relaxation process of CdSe/ZnMnSe quantum dots (QDs) was investigated using polarization-selective magneto-photoluminescence (PL). Peaks from the Mn 2+ internal transition, the CdSe QDs, and the ZnMnSe barrier were observed in the system. The CdSe QD peak was relatively weak while the intensity of the Mn 2+ transition was strong in the spectrum taken at zero magnetic field. However, the peaks intensities changed significantly when a magnetic field was applied, and the situation became reversed (i.e., the CdSe QD peak become stronger than the peak due to the Mn 2+ internal transition, specifically for σ + polarization). The opposite intensity behavior was observed in the peak from the Mn 2+ ions and in the PL of the CdSe QDs and revealed that these two carrier capture centers competed with each other for carriers excited in the ZnMnSe barrier. The variation in the Mn 2+ internal transition with the magnetic field was well described by using a model developed under an angular momentum selection rule. This suggests that competition between the two energy transfer processes in the CdSe/ZnMnSe QD system is responsible for the observed PL intensity behavior.

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