Zeeman mapping of exciton localization in self-assembled CdSe quantum dots using diluted magnetic semiconductors

S. Lee; M. Dobrowolska; J. K. Furdyna

doi:10.1016/j.ssc.2006.11.017

Zeeman mapping of exciton localization in self-assembled CdSe quantum dots using diluted magnetic semiconductors

S. Lee^*
, M. Dobrowolska
, J. K. Furdyna

^*Corresponding author for this work

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

7 Citations (Scopus)

Abstract

Localization of exciton wavefunctions in self-assembled quantum dots (QDs) has been investigated using CdSe QDs embedded in ZnMnSe. This system was chosen so as to make use of the giant Zeeman splitting in the diluted magnetic semiconductor (DMS) ZnMnSe, which enables one to map how the exciton wavefunction is distributed between the QDs and the surrounding matrix. Two series of CdSe QDs in ZnMnSe were prepared for this investigation by molecular beam epitaxy (MBE), either by varying the CdSe coverage while keeping a constant Mn concentration in ZnMnSe; or by varying the Mn concentration in the matrix while maintaining a constant CdSe coverage. Photoluminescence (PL) experiments show a systematic evolution of the CdSe QDs with increasing CdSe coverage; and also reveal the role of Mn in nucleating ("seeding") the self-assembly of the QDs. By simultaneously measuring the Zeeman shifts of the PL peaks from both the CdSe QDs and their ZnMnSe matrix, we are able to extract information on exciton localization in the QDs and its dependence on the degree of development of the self-assembled CdSe QDs with increasing CdSe coverage.

Original language	English
Pages (from-to)	311-315
Number of pages	5
Journal	Solid State Communications
Volume	141
Issue number	6
DOIs	https://doi.org/10.1016/j.ssc.2006.11.017
Publication status	Published - 2007 Feb

Bibliographical note

Funding Information:
This research was supported by NSF Grants DMR02-45227; by a Korea Research Foundation Grant (KRF-2004-005-C00068); by KOSEF through QSRC at Dongguk University; and by the Seoul R&BD Program.

Keywords

A. Magnetic semiconductor
A. Quantum dot
E. Zeeman mapping

ASJC Scopus subject areas

General Chemistry
Condensed Matter Physics
Materials Chemistry

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10.1016/j.ssc.2006.11.017

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title = "Zeeman mapping of exciton localization in self-assembled CdSe quantum dots using diluted magnetic semiconductors",

abstract = "Localization of exciton wavefunctions in self-assembled quantum dots (QDs) has been investigated using CdSe QDs embedded in ZnMnSe. This system was chosen so as to make use of the giant Zeeman splitting in the diluted magnetic semiconductor (DMS) ZnMnSe, which enables one to map how the exciton wavefunction is distributed between the QDs and the surrounding matrix. Two series of CdSe QDs in ZnMnSe were prepared for this investigation by molecular beam epitaxy (MBE), either by varying the CdSe coverage while keeping a constant Mn concentration in ZnMnSe; or by varying the Mn concentration in the matrix while maintaining a constant CdSe coverage. Photoluminescence (PL) experiments show a systematic evolution of the CdSe QDs with increasing CdSe coverage; and also reveal the role of Mn in nucleating ({"}seeding{"}) the self-assembly of the QDs. By simultaneously measuring the Zeeman shifts of the PL peaks from both the CdSe QDs and their ZnMnSe matrix, we are able to extract information on exciton localization in the QDs and its dependence on the degree of development of the self-assembled CdSe QDs with increasing CdSe coverage.",

keywords = "A. Magnetic semiconductor, A. Quantum dot, E. Zeeman mapping",

author = "S. Lee and M. Dobrowolska and Furdyna, \{J. K.\}",

note = "Funding Information: This research was supported by NSF Grants DMR02-45227; by a Korea Research Foundation Grant (KRF-2004-005-C00068); by KOSEF through QSRC at Dongguk University; and by the Seoul R\&BD Program.",

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AU - Dobrowolska, M.

AU - Furdyna, J. K.

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N2 - Localization of exciton wavefunctions in self-assembled quantum dots (QDs) has been investigated using CdSe QDs embedded in ZnMnSe. This system was chosen so as to make use of the giant Zeeman splitting in the diluted magnetic semiconductor (DMS) ZnMnSe, which enables one to map how the exciton wavefunction is distributed between the QDs and the surrounding matrix. Two series of CdSe QDs in ZnMnSe were prepared for this investigation by molecular beam epitaxy (MBE), either by varying the CdSe coverage while keeping a constant Mn concentration in ZnMnSe; or by varying the Mn concentration in the matrix while maintaining a constant CdSe coverage. Photoluminescence (PL) experiments show a systematic evolution of the CdSe QDs with increasing CdSe coverage; and also reveal the role of Mn in nucleating ("seeding") the self-assembly of the QDs. By simultaneously measuring the Zeeman shifts of the PL peaks from both the CdSe QDs and their ZnMnSe matrix, we are able to extract information on exciton localization in the QDs and its dependence on the degree of development of the self-assembled CdSe QDs with increasing CdSe coverage.

AB - Localization of exciton wavefunctions in self-assembled quantum dots (QDs) has been investigated using CdSe QDs embedded in ZnMnSe. This system was chosen so as to make use of the giant Zeeman splitting in the diluted magnetic semiconductor (DMS) ZnMnSe, which enables one to map how the exciton wavefunction is distributed between the QDs and the surrounding matrix. Two series of CdSe QDs in ZnMnSe were prepared for this investigation by molecular beam epitaxy (MBE), either by varying the CdSe coverage while keeping a constant Mn concentration in ZnMnSe; or by varying the Mn concentration in the matrix while maintaining a constant CdSe coverage. Photoluminescence (PL) experiments show a systematic evolution of the CdSe QDs with increasing CdSe coverage; and also reveal the role of Mn in nucleating ("seeding") the self-assembly of the QDs. By simultaneously measuring the Zeeman shifts of the PL peaks from both the CdSe QDs and their ZnMnSe matrix, we are able to extract information on exciton localization in the QDs and its dependence on the degree of development of the self-assembled CdSe QDs with increasing CdSe coverage.

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KW - A. Quantum dot

KW - E. Zeeman mapping

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Zeeman mapping of exciton localization in self-assembled CdSe quantum dots using diluted magnetic semiconductors

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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