Polarization selective magneto-optical study on the coupled quantum dots using resonant excitation

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

doi:10.1016/j.physe.2003.11.038

Polarization selective magneto-optical study on the coupled quantum dots using resonant excitation

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

Research output: Contribution to journal › Conference article › peer-review

3 Citations (Scopus)

Abstract

We have studied a double-layer self-assembled quantum dot (QD) structures consisting of non-magnetic CdSe and magnetic CdMnSe. Transmission electron microscopy image shows that QDs are formed within the CdSe and CdMnSe layers, and they are vertically correlated in the system. The strong interband ground state transition was observed in magneto-photoluminescence (PL) experiments. In contrast to a typical behavior for many low-dimensional systems involving diluted magnetic semiconductors (DMSs), where PL signal dramatically increases when an external magnetic field is applied, we have observed a significant decrease of the PL intensity as a function of magnetic field in the double-layer structures where the alternating QD layers contain the DMS and non-DMS QDs. We attribute such effect to carrier transfer from non-magnetic CdSe dots to magnetic CdMnSe dots due to the large Zeeman shift of the band edges of DMS QDs in magnetic field. Since the band alignment of QD structure strongly depends on the spin states of system, we performed polarization-selective PL measurement to identify spin-dependent carrier tunneling in this coupled system.

Original language	English
Pages (from-to)	376-380
Number of pages	5
Journal	Physica E: Low-Dimensional Systems and Nanostructures
Volume	21
Issue number	2-4
DOIs	https://doi.org/10.1016/j.physe.2003.11.038
Publication status	Published - 2004 Mar
Event	Proceedings of the Eleventh International Conference on Modulation (MSS11) - Nara, Japan Duration: 2003 Jul 14 → 2003 Jul 18

Bibliographical note

Funding Information:
This work was supported by Korea Research Foundation Grant (KRF-2002-003-C00044) by the Korea Science and Engineering Foundation (KOSEF) through the Quantum Functional Semiconductor Research Center (QSRC) at Dongguk University; and by KIST vision 21 project.

Keywords

Photoluminescence
Polarization
Quantum dots
Zeeman shift

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Condensed Matter Physics

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10.1016/j.physe.2003.11.038

Cite this

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title = "Polarization selective magneto-optical study on the coupled quantum dots using resonant excitation",

abstract = "We have studied a double-layer self-assembled quantum dot (QD) structures consisting of non-magnetic CdSe and magnetic CdMnSe. Transmission electron microscopy image shows that QDs are formed within the CdSe and CdMnSe layers, and they are vertically correlated in the system. The strong interband ground state transition was observed in magneto-photoluminescence (PL) experiments. In contrast to a typical behavior for many low-dimensional systems involving diluted magnetic semiconductors (DMSs), where PL signal dramatically increases when an external magnetic field is applied, we have observed a significant decrease of the PL intensity as a function of magnetic field in the double-layer structures where the alternating QD layers contain the DMS and non-DMS QDs. We attribute such effect to carrier transfer from non-magnetic CdSe dots to magnetic CdMnSe dots due to the large Zeeman shift of the band edges of DMS QDs in magnetic field. Since the band alignment of QD structure strongly depends on the spin states of system, we performed polarization-selective PL measurement to identify spin-dependent carrier tunneling in this coupled system.",

keywords = "Photoluminescence, Polarization, Quantum dots, Zeeman shift",

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

note = "Funding Information: This work was supported by Korea Research Foundation Grant (KRF-2002-003-C00044) by the Korea Science and Engineering Foundation (KOSEF) through the Quantum Functional Semiconductor Research Center (QSRC) at Dongguk University; and by KIST vision 21 project. ; Proceedings of the Eleventh International Conference on Modulation (MSS11) ; Conference date: 14-07-2003 Through 18-07-2003",

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language = "English",

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AU - Lee, S.

AU - Shin, D. Y.

AU - Lee, H. S.

AU - Lee, J. Y.

AU - Dobrowolska, M.

AU - Furdyna, J. K.

N1 - Funding Information: This work was supported by Korea Research Foundation Grant (KRF-2002-003-C00044) by the Korea Science and Engineering Foundation (KOSEF) through the Quantum Functional Semiconductor Research Center (QSRC) at Dongguk University; and by KIST vision 21 project.

PY - 2004/3

Y1 - 2004/3

N2 - We have studied a double-layer self-assembled quantum dot (QD) structures consisting of non-magnetic CdSe and magnetic CdMnSe. Transmission electron microscopy image shows that QDs are formed within the CdSe and CdMnSe layers, and they are vertically correlated in the system. The strong interband ground state transition was observed in magneto-photoluminescence (PL) experiments. In contrast to a typical behavior for many low-dimensional systems involving diluted magnetic semiconductors (DMSs), where PL signal dramatically increases when an external magnetic field is applied, we have observed a significant decrease of the PL intensity as a function of magnetic field in the double-layer structures where the alternating QD layers contain the DMS and non-DMS QDs. We attribute such effect to carrier transfer from non-magnetic CdSe dots to magnetic CdMnSe dots due to the large Zeeman shift of the band edges of DMS QDs in magnetic field. Since the band alignment of QD structure strongly depends on the spin states of system, we performed polarization-selective PL measurement to identify spin-dependent carrier tunneling in this coupled system.

AB - We have studied a double-layer self-assembled quantum dot (QD) structures consisting of non-magnetic CdSe and magnetic CdMnSe. Transmission electron microscopy image shows that QDs are formed within the CdSe and CdMnSe layers, and they are vertically correlated in the system. The strong interband ground state transition was observed in magneto-photoluminescence (PL) experiments. In contrast to a typical behavior for many low-dimensional systems involving diluted magnetic semiconductors (DMSs), where PL signal dramatically increases when an external magnetic field is applied, we have observed a significant decrease of the PL intensity as a function of magnetic field in the double-layer structures where the alternating QD layers contain the DMS and non-DMS QDs. We attribute such effect to carrier transfer from non-magnetic CdSe dots to magnetic CdMnSe dots due to the large Zeeman shift of the band edges of DMS QDs in magnetic field. Since the band alignment of QD structure strongly depends on the spin states of system, we performed polarization-selective PL measurement to identify spin-dependent carrier tunneling in this coupled system.

KW - Photoluminescence

KW - Polarization

KW - Quantum dots

KW - Zeeman shift

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DO - 10.1016/j.physe.2003.11.038

M3 - Conference article

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JO - Physica E: Low-Dimensional Systems and Nanostructures

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Y2 - 14 July 2003 through 18 July 2003

ER -

Polarization selective magneto-optical study on the coupled quantum dots using resonant excitation

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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