Influence of inter-dot coupling on spin polarization of carriers in double quantum dots

S. Lee; S. R.Eric Yang; M. Dobrowolska; J. K. Furdyna

doi:10.1088/0268-1242/19/9/010

Influence of inter-dot coupling on spin polarization of carriers in double quantum dots

S. Lee, S. R.Eric Yang, M. Dobrowolska, J. K. Furdyna

Department of Physics

Research output: Contribution to journal › Article › peer-review

26 Citations (Scopus)

Abstract

We have performed magneto-photoluminescence (PL) experiments on a self-assembled coupled double quantum dot (QD) system consisting of adjacent CdSe and CdZnSe QD layers. We have observed well-separated two PL peaks in such a double layer QD system, corresponding to the CdSe and the CdZnSe QDs. The PL signal was studied using circularly polarized detection. The intensities of the two PL peaks exhibited significant differences for the two circular polarizations when a magnetic field applied, in contrast to the behaviour shown by single layer CdSe or CdZnSe QD systems, which show nearly identical polarization dependence on the field. The observed behaviour can be interpreted in terms of interaction between carriers localized in pairs of QDs that are electronically coupled.

Original language	English
Pages (from-to)	1125-1130
Number of pages	6
Journal	Semiconductor Science and Technology
Volume	19
Issue number	9
DOIs	https://doi.org/10.1088/0268-1242/19/9/010
Publication status	Published - 2004 Sept

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering
Materials Chemistry

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AU - Lee, S.

AU - Yang, S. R.Eric

AU - Dobrowolska, M.

AU - Furdyna, J. K.

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AB - We have performed magneto-photoluminescence (PL) experiments on a self-assembled coupled double quantum dot (QD) system consisting of adjacent CdSe and CdZnSe QD layers. We have observed well-separated two PL peaks in such a double layer QD system, corresponding to the CdSe and the CdZnSe QDs. The PL signal was studied using circularly polarized detection. The intensities of the two PL peaks exhibited significant differences for the two circular polarizations when a magnetic field applied, in contrast to the behaviour shown by single layer CdSe or CdZnSe QD systems, which show nearly identical polarization dependence on the field. The observed behaviour can be interpreted in terms of interaction between carriers localized in pairs of QDs that are electronically coupled.

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Influence of inter-dot coupling on spin polarization of carriers in double quantum dots

Abstract

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