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Optical Properties of Semimagnetic Quantum Dots

Published online by Cambridge University Press:  11 February 2011

S. Mackowski ,
T. A. Nguyen ,
H. E. Jackson ,
L. M. Smith ,
J. Kossut ,
G. Karczewski  and
W. Heiss
S. Mackowski*
Affiliation:
Dept. of Physics, Univ. of Cincinnati, Cincinnati, OH 45221–0011, United States
T. A. Nguyen
Affiliation:
Dept. of Physics, Univ. of Cincinnati, Cincinnati, OH 45221–0011, United States
H. E. Jackson
Affiliation:
Dept. of Physics, Univ. of Cincinnati, Cincinnati, OH 45221–0011, United States
L. M. Smith
Affiliation:
Dept. of Physics, Univ. of Cincinnati, Cincinnati, OH 45221–0011, United States
J. Kossut
Affiliation:
Institute of Physics, Polish Academy of Science, Warsaw, Poland
G. Karczewski
Affiliation:
Institute of Physics, Polish Academy of Science, Warsaw, Poland
W. Heiss
Affiliation:
Institut für Festkörperphysik, Johannes Kepler Universität Linz, Austria
*
corresponding author, electronic mail: [email protected]
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Abstract

Measurements of optical properties of epitaxially grown CdMnTe quantum dots are presented. Magnetic ions are incorporated into the structure by passivating the substrate surface with Mn prior the quantum dot deposition. As expected, the intensity of intra-Mn transition increases with the time of manganese passivation. The formation of magnetic quantum dots is evidenced by presence of single emission lines in the micro-photoluminescence spectrum. The width of single dot emission lines is much broader than observed for non-magnetic quantum dots. The broadening is caused by thermal fluctuations of magnetization in quantum dots. Resonant spectroscopy results indicate that the exciton-optical phonon scattering is the main energy relaxation mechanism in these structures. The measurements suggest that post-growth thermal processing offers the possibility of tuning the magnetic properties of these structures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 737 , 2002 , E9.1
Copyright
Copyright © Materials Research Society 2003

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References

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