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 | |
| 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
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
}
TY - GEN
T1 - Structural and magneto-optical studies on multiple quantum dots containing magnetic semiconductors
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.
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.
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UR - http://www.scopus.com/inward/citedby.url?scp=84875106817&partnerID=8YFLogxK
U2 - 10.1002/pssc.200303069
DO - 10.1002/pssc.200303069
M3 - Conference contribution
SP - 1283
EP - 1287
BT - Physica Status Solidi C: Conferences
ER -