Structural and magneto-optical studies on multiple quantum dots containing magnetic semiconductors

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

doi:10.1002/pssc.200303069

Structural and magneto-optical studies on multiple quantum dots containing magnetic semiconductors

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

Department of Physics

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

We have fabricated single and multi-layer self-assembled quantum dot (QD) systems based on CdSe/ZnSe combination, including magnetic semiconductors (DMSs). Transmission electron microscopy (TEM) images shows that magnetic QDs are formed within the CdMnSe layer, and they are vertically correlated in multi-layer quantum dot systems. Magneto-optical experiments were also carried out on those structures. The PL energy from multi-layer QDs 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 multi-layer form exhibit a large intensity enhancements and energy shifts, a behavior that is typical for many low dimensional systems involving DMSs. The observed weak PL energy dependence in low magnetic fields can be understood in terms of magnetic polaron formation in these DMS QD systems. We also discuss statistical magnetic fluctuations in these systems, as revealed by PL line narrowing in a magnetic field.

Original language	English
Title of host publication	Physica Status Solidi C: Conferences
Pages	1283-1287
Number of pages	5
Edition	4
DOIs	https://doi.org/10.1002/pssc.200303069
Publication status	Published - 2003
Event	2nd International Conference on Semiconductor Quantum Dots, QD 2002 - Tokyo, Japan Duration: 2002 Sep 30 → 2002 Oct 3

Other

Other	2nd International Conference on Semiconductor Quantum Dots, QD 2002
Country	Japan
City	Tokyo
Period	02/9/30 → 02/10/3

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ASJC Scopus subject areas

Condensed Matter Physics
Electronic, Optical and Magnetic Materials
Materials Chemistry

Cite this

Lee, S. H., Shin, D. Y., Lee, H. S., Lee, J. Y., Titova, L. V., Kutrowski, M., Furdyna, J. K., & Dobrowolska, M. (2003). Structural and magneto-optical studies on multiple quantum dots containing magnetic semiconductors. In Physica Status Solidi C: Conferences (4 ed., pp. 1283-1287) https://doi.org/10.1002/pssc.200303069

Structural and magneto-optical studies on multiple quantum dots containing magnetic semiconductors. / Lee, Sang Hoon; Shin, D. Y.; Lee, H. S.; Lee, J. Y.; Titova, L. V.; Kutrowski, M.; Furdyna, J. K.; Dobrowolska, M.

Physica Status Solidi C: Conferences. 4. ed. 2003. p. 1283-1287.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Lee, SH, Shin, DY, Lee, HS, Lee, JY, Titova, LV, Kutrowski, M, Furdyna, JK & Dobrowolska, M 2003, Structural and magneto-optical studies on multiple quantum dots containing magnetic semiconductors. in Physica Status Solidi C: Conferences. 4 edn, pp. 1283-1287, 2nd International Conference on Semiconductor Quantum Dots, QD 2002, Tokyo, Japan, 02/9/30. https://doi.org/10.1002/pssc.200303069

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abstract = "We have fabricated single and multi-layer self-assembled quantum dot (QD) systems based on CdSe/ZnSe combination, including magnetic semiconductors (DMSs). Transmission electron microscopy (TEM) images shows that magnetic QDs are formed within the CdMnSe layer, and they are vertically correlated in multi-layer quantum dot systems. Magneto-optical experiments were also carried out on those structures. The PL energy from multi-layer QDs 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 multi-layer form exhibit a large intensity enhancements and energy shifts, a behavior that is typical for many low dimensional systems involving DMSs. The observed weak PL energy dependence in low magnetic fields can be understood in terms of magnetic polaron formation in these DMS QD systems. We also discuss statistical magnetic fluctuations in these systems, as revealed by PL line narrowing in a magnetic field.",

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AU - Lee, Sang Hoon

AU - Shin, D. Y.

AU - Lee, H. S.

AU - Lee, J. Y.

AU - Titova, L. V.

AU - Kutrowski, M.

AU - Furdyna, J. K.

AU - Dobrowolska, M.

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AB - We have fabricated single and multi-layer self-assembled quantum dot (QD) systems based on CdSe/ZnSe combination, including magnetic semiconductors (DMSs). Transmission electron microscopy (TEM) images shows that magnetic QDs are formed within the CdMnSe layer, and they are vertically correlated in multi-layer quantum dot systems. Magneto-optical experiments were also carried out on those structures. The PL energy from multi-layer QDs 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 multi-layer form exhibit a large intensity enhancements and energy shifts, a behavior that is typical for many low dimensional systems involving DMSs. The observed weak PL energy dependence in low magnetic fields can be understood in terms of magnetic polaron formation in these DMS QD systems. We also discuss statistical magnetic fluctuations in these systems, as revealed by PL line narrowing in a magnetic field.

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Access to Document

10.1002/pssc.200303069