Magneto-optical study of multiple layers of self-assembled quantum dots involving diluted magnetic semiconductors

Sang Hoon Lee, D. Y. Shin, L. V. Titova, M. Kutrowski, J. K. Furdyna, M. Dobrowolska

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Magneto-optical experiments were carried out on structures comprised of multiple layers of self-assembled quantum dots (QDs) involving diluted magnetic semiconductors (DMSs). Photoluminescence (PL) from interband ground state transitions was clearly observed in these DMS-based QD systems. The PL energy from QD multilayers appears at a lower energy than that emitted by a single QD layer, suggesting that there exists electronic coupling between the QD layers. When an external magnetic field is applied, the PL peaks from QDs both in single-layer and in multilayer form exhibit large Zeeman shifts and a significant enhancement of intensity, a behavior that is typical for many low dimensional systems involving DMSs. In contrast to this behavior, however, we have observed a decrease of the PL intensity as a function of magnetic field in multilayer structures where alternating QW layers contain DMS and non-DMS QDs. We will show evidence that this effect arises from carrier transfer between pairs of QDs from adjacent layers (double QDs) due to the large Zeeman shifts of the conduction and valence bands characteristic of DMS QDs.

Original languageEnglish
Pages (from-to)453-456
Number of pages4
JournalJournal of Superconductivity and Novel Magnetism
Volume16
Issue number2
Publication statusPublished - 2003 Dec 1

Fingerprint

Semiconductor quantum dots
quantum dots
Photoluminescence
photoluminescence
Multilayers
Diluted magnetic semiconductors
Magnetic fields
Magnetic semiconductors
shift
Electron transitions
Valence bands
Conduction bands
magnetic fields
Ground state
laminates
conduction bands
valence
ground state
energy
augmentation

Keywords

  • Magnetic semiconductors
  • Quantum dots
  • Zeeman shifts

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Physics and Astronomy (miscellaneous)

Cite this

Magneto-optical study of multiple layers of self-assembled quantum dots involving diluted magnetic semiconductors. / Lee, Sang Hoon; Shin, D. Y.; Titova, L. V.; Kutrowski, M.; Furdyna, J. K.; Dobrowolska, M.

In: Journal of Superconductivity and Novel Magnetism, Vol. 16, No. 2, 01.12.2003, p. 453-456.

Research output: Contribution to journalArticle

Lee, Sang Hoon ; Shin, D. Y. ; Titova, L. V. ; Kutrowski, M. ; Furdyna, J. K. ; Dobrowolska, M. / Magneto-optical study of multiple layers of self-assembled quantum dots involving diluted magnetic semiconductors. In: Journal of Superconductivity and Novel Magnetism. 2003 ; Vol. 16, No. 2. pp. 453-456.
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