Experimental evidence for antiferromagnetic spin-spin interaction between carriers localized in coupled quantum dots

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

doi:10.1063/1.1855422

Experimental evidence for antiferromagnetic spin-spin interaction between carriers localized in coupled quantum dots

S. Lee, H. S. Lee, J. Y. Lee, M. Dobrowolska, J. K. Furdyna

Department of Physics

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

22 Citations (Scopus)

Abstract

A self-assembled quantum dot (QD) system consisting of adjacent CdSe and CdZnMnSe QD layers in a ZnSe matrix was investigated using polarization-selective magnetophotoluminescence (PL). We can unambiguously identify which QD peak originates from which material, because PL from CdZnMnSe (a diluted magnetic semiconductor) exhibits a large Zeeman shift in the presence of a magnetic field. Significant enhancement of the degree of σ- circular polarization emitted by the nonmagnetic CdSe QDs is observed in the double layer system, as compared to that observed in similar CdSe QDs without the influence of neighboring CdZnMnSe QDs. This behavior can be understood in terms of antiferromagnetic interaction between carrier spins localized in pairs of CdSe and CdZnMnSe QDs that are electronically coupled.

Original language	English
Article number	033114
Pages (from-to)	1-3
Number of pages	3
Journal	Applied Physics Letters
Volume	86
Issue number	3
DOIs	https://doi.org/10.1063/1.1855422
Publication status	Published - 2005 Jan 17

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.1855422

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title = "Experimental evidence for antiferromagnetic spin-spin interaction between carriers localized in coupled quantum dots",

abstract = "A self-assembled quantum dot (QD) system consisting of adjacent CdSe and CdZnMnSe QD layers in a ZnSe matrix was investigated using polarization-selective magnetophotoluminescence (PL). We can unambiguously identify which QD peak originates from which material, because PL from CdZnMnSe (a diluted magnetic semiconductor) exhibits a large Zeeman shift in the presence of a magnetic field. Significant enhancement of the degree of σ- circular polarization emitted by the nonmagnetic CdSe QDs is observed in the double layer system, as compared to that observed in similar CdSe QDs without the influence of neighboring CdZnMnSe QDs. This behavior can be understood in terms of antiferromagnetic interaction between carrier spins localized in pairs of CdSe and CdZnMnSe QDs that are electronically coupled.",

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

note = "Funding Information: This research was supported by NSF Grant Nos. DMR02-45227 and DMR02-01519; the DARPA SpinS Program; and by the Korea Science and Engineering Foundation (KOSEF) through the Quantum Functional Semiconductor Research Center (QSRC) at Dongguk University; and by Korea Research Foundation Grant No. KRF-2004-005-C00068. ",

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doi = "10.1063/1.1855422",

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T1 - Experimental evidence for antiferromagnetic spin-spin interaction between carriers localized in coupled quantum dots

AU - Lee, S.

AU - Lee, H. S.

AU - Lee, J. Y.

AU - Dobrowolska, M.

AU - Furdyna, J. K.

N1 - Funding Information: This research was supported by NSF Grant Nos. DMR02-45227 and DMR02-01519; the DARPA SpinS Program; and by the Korea Science and Engineering Foundation (KOSEF) through the Quantum Functional Semiconductor Research Center (QSRC) at Dongguk University; and by Korea Research Foundation Grant No. KRF-2004-005-C00068.

PY - 2005/1/17

Y1 - 2005/1/17

N2 - A self-assembled quantum dot (QD) system consisting of adjacent CdSe and CdZnMnSe QD layers in a ZnSe matrix was investigated using polarization-selective magnetophotoluminescence (PL). We can unambiguously identify which QD peak originates from which material, because PL from CdZnMnSe (a diluted magnetic semiconductor) exhibits a large Zeeman shift in the presence of a magnetic field. Significant enhancement of the degree of σ- circular polarization emitted by the nonmagnetic CdSe QDs is observed in the double layer system, as compared to that observed in similar CdSe QDs without the influence of neighboring CdZnMnSe QDs. This behavior can be understood in terms of antiferromagnetic interaction between carrier spins localized in pairs of CdSe and CdZnMnSe QDs that are electronically coupled.

AB - A self-assembled quantum dot (QD) system consisting of adjacent CdSe and CdZnMnSe QD layers in a ZnSe matrix was investigated using polarization-selective magnetophotoluminescence (PL). We can unambiguously identify which QD peak originates from which material, because PL from CdZnMnSe (a diluted magnetic semiconductor) exhibits a large Zeeman shift in the presence of a magnetic field. Significant enhancement of the degree of σ- circular polarization emitted by the nonmagnetic CdSe QDs is observed in the double layer system, as compared to that observed in similar CdSe QDs without the influence of neighboring CdZnMnSe QDs. This behavior can be understood in terms of antiferromagnetic interaction between carrier spins localized in pairs of CdSe and CdZnMnSe QDs that are electronically coupled.

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DO - 10.1063/1.1855422

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JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 3

M1 - 033114

ER -

Experimental evidence for antiferromagnetic spin-spin interaction between carriers localized in coupled quantum dots

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