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Science 5 December 1997:
Vol. 278. no. 5344, pp. 1792 - 1795
DOI: 10.1126/science.278.5344.1792
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Reports

Coupled Quantum Dots Fabricated by Cleaved Edge Overgrowth: From Artificial Atoms to Molecules

Gert Schedelbeck, Werner Wegscheider, * Max Bichler, Gerhard Abstreiter

Atomically precise quantum dots of mesoscopic size have been fabricated in the gallium arsenide-aluminum gallium arsenide material system by cleaved edge overgrowth, with a high degree of control over shape, composition, and position. The formation of bonding and antibonding states between two such "artificial atoms" was studied as a function of quantum dot separation by microscopic photoluminescence (PL) spectroscopy. The coupling strength within these "artificial molecules" is characterized by a systematic dependence of the separation of the bonding and antibonding levels, and of the PL linewidth, on the "interatomic" distance. This model system opens new insights into the physics of coupled quantum objects.

Walter Schottky Institut, Technische Universität München, Am Coulombwall, D-85748 Garching, Germany.
*   To whom correspondence should be addressed. E-mail: wegscheider{at}wsi.tu-muenchen.de

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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