Direct Observation of Controlled Coupling in an Individual Quantum Dot Molecule

Details Direct Observation of Controlled Coupling in an Individual Quantum Dot Molecule Direct Observation of Controlled Coupling in an Individual Quantum Dot Molecule

2004-10-08

arxiv.org/abs/cond-mat/0410206v2

Phys. Rev. Lett. 94, 057402 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 4 figures submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevLett.94.057402

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.

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