Inter-dot spin exchange interaction in coupled II-VI semiconductor quantum dots

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

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We have performed polarization selective photoluminescence (PL) experiment on a series of self-assembled quantum dots (QDs) in the form of single- and double-QD layer systems. The double layers were formed from diluted magnetic semiconductor (DMS) (either CdMnSe or CdZnMnSe) and non-DMS (either CdSe or CdZnSe) layers, separated by non-DMS ZnSe barriers. The peaks from DMS and non-DMS QD layers are clearly resolved in the PL spectra taken at zero magnetic field. When a magnetic field is applied to the double layer QD (DLQD) system, the intensities of the circularly polarized PL peaks corresponding to the non-DMS (i.e., CdSe and CdZnSe) layers exhibit significant changes, reflecting correspondingly large changes in the degrees of spin polarization of the non-DMS QDs. This enhancement of spin polarization observed in the double-layer QD structures is interpreted in terms of anti-parallel spin interaction between carriers localized in the coupled QD pairs.

Original languageEnglish
Pages (from-to)799-804
Number of pages6
JournalPhysica Status Solidi (B) Basic Research
Volume243
Issue number4
DOIs
Publication statusPublished - 2006 Mar 1

Fingerprint

spin exchange
Exchange interactions
Semiconductor quantum dots
Magnetic semiconductors
quantum dots
interactions
Photoluminescence
Spin polarization
photoluminescence
polarization
Magnetic fields
II-VI semiconductors
magnetic fields
Polarization
augmentation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Inter-dot spin exchange interaction in coupled II-VI semiconductor quantum dots. / Lee, Sang Hoon; Dobrowolska, M.; Furdyna, J. K.

In: Physica Status Solidi (B) Basic Research, Vol. 243, No. 4, 01.03.2006, p. 799-804.

Research output: Contribution to journalArticle

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