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Phys. Rev. B 80, 195321 (2009) [6 pages]

Fabrication and luminescence properties of self-assembled CdTe quantum dots embedded in an MnTe matrix

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P. Wojnar1,2, J. Suffczyński3, A. Golnik3, A. Ebbens4, U. Woggon4, G. Karczewski1, and J. Kossut1,5
1Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland
2CEA-CNRS Group “Nanophysique et Semiconducteurs,” Institute Néel, Université J. Fourier, 25 Avenue des Martyrs, F-38054 Grenoble, France
3Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland
4Experimentelle Physik IIb, University of Dortmund, Otto-Hahn Str 4, D44-221 Dortmund, Germany
5ERATO Semiconductors Spintronics Project, Al. Lotników 32/46, 02-668 Warsaw, Poland

Received 6 October 2009; published 25 November 2009

The growth of self-assembled CdTe quantum dots embedded in cubic MnTe by molecular beam epitaxy is reported. The dots are forced to form despite a small lattice mismatch of 2.3% between the dot and the barrier materials. Their properties are studied by means of time integrated and time resolved photoluminescence at various temperatures and magnetic fields. We demonstrate a considerable diffusion of Mn ions from the MnTe barrier into nominally nonmagnetic CdTe quantum dot, which is manifested as an enhancement of their magneto-optical effects, such as the Zeeman splitting of excitonic levels in the dots.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.80.195321
DOI:
10.1103/PhysRevB.80.195321
PACS:
78.67.Hc, 75.50.Pp, 75.75.+a
 
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