Direct Observation of Controlled Coupling in an Individual Quantum Dot Molecule

Abstract

We report the direct observation of quantum coupling in individual quantum dot molecules and its manipulation using static electric fields. A pronounced anti-crossing of different excitonic transitions is observed as the electric field is tuned. Comparison of our experimental results with theory shows that the observed anti-crossing occurs between excitons with predominant spatially \emph{direct} and \emph{indirect} character. The electron component of the exciton wavefunction is shown to have molecular character at the anti-crossing and the quantum coupling strength is deduced optically. In addition, we determine the dependence of the coupling strength on the inter-dot separation and identify a field driven transition of the nature of the molecular ground state.

11 pages, 4 figures submitted to Physical Review Letters

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• Quantum-Information Processing with Semiconductor Macroatoms
• Coherent control of tunneling in a quantum dot molecule
• Anomalous quantum confined Stark effects in stacked InAs/GaAs self-assembled quantum dots
• Theory of excitonic spectra and entanglement engineering in dot molecules
• Photoluminescence of a single InAs quantum dot molecule under applied electric field

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