Control of spin state in CdSe quantum dots by coupling with magnetic semiconductor quantum dots

Eunsoon Oh, D. G. Choi, Shin Kim, S. Lee, J. K. Furdyna, D. G. Oh

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We studied spin states of CdSe quantum dots (QDs) coupled with CdMnSe QDs by probing circular polarization of photoluminescence spectrum under external magnetic fields. The bandgap energies of CdSe and CdMnSe QDs are close to each other and photoluminescence mainly originates from CdSe QDs due to relatively low radiation efficiency of CdMnSe QDs. The photoluminescence lifetime as well as its intensity was decreased with increasing magnetic field, which was ascribed to the increase in the ground state wavefunctions in CdMnSe QDs. The decrease was more pronounced for spin down electrons, which was explained by the difference in spin up and down wave functions under magnetic fields. Our results show that the spin state of CdSe QDs can be manipulated by coupling with CdMnSe QDs.

Original languageEnglish
Pages (from-to)471-474
Number of pages4
JournalSolid State Communications
Volume135
Issue number8
DOIs
Publication statusPublished - 2005 Aug

Keywords

  • A. Magnetic semiconductor
  • A. Quantum dot
  • D. Magneto-optics

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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