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

S. 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

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

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

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
Pages (from-to)	1283-1287
Number of pages	5
Journal	Physica Status Solidi C: Conferences
Issue number	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 Sept 30 → 2002 Oct 3

ASJC Scopus subject areas

Condensed Matter Physics

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title = "Structural and magneto-optical studies on multiple quantum dots containing magnetic semiconductors",

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.",

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

year = "2003",

doi = "10.1002/pssc.200303069",

language = "English",

pages = "1283--1287",

journal = "Physica Status Solidi C: Conferences",

issn = "1610-1634",

publisher = "Wiley-VCH Verlag",

number = "4",

note = "2nd International Conference on Semiconductor Quantum Dots, QD 2002 ; Conference date: 30-09-2002 Through 03-10-2002",

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TY - JOUR

T1 - Structural and magneto-optical studies on multiple quantum dots containing magnetic semiconductors

AU - Lee, S.

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.

PY - 2003

Y1 - 2003

N2 - 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.

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.

UR - http://www.scopus.com/inward/record.url?scp=84875106817&partnerID=8YFLogxK

U2 - 10.1002/pssc.200303069

DO - 10.1002/pssc.200303069

M3 - Conference article

AN - SCOPUS:84875106817

SN - 1610-1634

SP - 1283

EP - 1287

JO - Physica Status Solidi C: Conferences

JF - Physica Status Solidi C: Conferences

IS - 4

T2 - 2nd International Conference on Semiconductor Quantum Dots, QD 2002

Y2 - 30 September 2002 through 3 October 2002

ER -

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

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