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Science 31 March 1995:
Vol. 267. no. 5206, pp. 1966 - 1968
DOI: 10.1126/science.267.5206.1966
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Articles

Spatially Resolved Visible Luminescence of Self-Assembled Semiconductor Quantum Dots

R. Leon 1, P. M. Petroff 2, D. Leonard 3, and S. Fafard 1

1 Center for Quantized Electronic Structures (QUEST), University of California, Santa Barbara, CA, 93106, USA.
2 Center for Quantized Electronic Structures (QUEST), Materials Department, and Electrical and Computer Engineering Department, University of California, Santa Barbara, CA, 93106, USA.
3 Center for Quantized Electronic Structures (QUEST) and Materials Department, University of California, Santa Barbara, CA, 93106, USA.

Correspondence should be addressed at the Department of Electronic Materials Engineering, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200, Australia

Ensembles of defect-free InAIAs islands of ultrasmall dimensions embedded in AIGaAs have been grown by molecular beam epitaxy. Cathodoluminescence was used to directly image the spatial distribution of the quantum dots by mapping their luminescence and to spectrally resolve very sharp peaks from small groups of dots, thus providing experimental verification for the discrete density of states in a zero-dimensional quantum structure. Visible luminescence is produced by different nominal compositions of InxAI(1–x)As-AIyGa(1–y)As.

Submitted on August 16, 1994
Accepted on January 5, 1995


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