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Updated: Aug 11, 2026

Compact Quantum Dots for Single-molecule Imaging
Published on: October 9, 2012
Coupled quantum dots fabricated by cleaved edge overgrowth: from artificial atoms to molecules
Schedelbeck1, Wegscheider, Bichler
1Walter Schottky Institut, Technische Universitat Munchen, Am Coulombwall, D-85748 Garching, Germany.
Abstract:
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.
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