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 | |
| Publication status | Published - 2004 Mar 1 |
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Keywords
- Photoluminescence
- Polarization
- Quantum dots
- Zeeman shift
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
Cite this
Polarization selective magneto-optical study on the coupled quantum dots using resonant excitation. / Lee, Sang Hoon; Shin, D. Y.; Lee, H. S.; Lee, J. Y.; Dobrowolska, M.; Furdyna, J. K.
In: Physica E: Low-Dimensional Systems and Nanostructures, Vol. 21, No. 2-4, 01.03.2004, p. 376-380.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Polarization selective magneto-optical study on the coupled quantum dots using resonant excitation
AU - Lee, Sang Hoon
AU - Shin, D. Y.
AU - Lee, H. S.
AU - Lee, J. Y.
AU - Dobrowolska, M.
AU - Furdyna, J. K.
PY - 2004/3/1
Y1 - 2004/3/1
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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UR - http://www.scopus.com/inward/citedby.url?scp=1642323911&partnerID=8YFLogxK
U2 - 10.1016/j.physe.2003.11.038
DO - 10.1016/j.physe.2003.11.038
M3 - Article
AN - SCOPUS:1642323911
VL - 21
SP - 376
EP - 380
JO - Physica E: Low-Dimensional Systems and Nanostructures
JF - Physica E: Low-Dimensional Systems and Nanostructures
SN - 1386-9477
IS - 2-4
ER -