Direct Observation of Controlled Coupling in an Individual Quantum Dot Molecule

2004/10/31 by Hubert J. Krenner, H. J. Krenner, M. Sabathil +8 · 9 citations
Engineering · Physics and Astronomy · #Molecular Junctions and Nanostructures #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #cond-mat.mes-hall #physics.optics

paper · pdf · doi:10.1103/physrevlett.94.057402

published as Phys. Rev. Lett. 94, 057402 (2005) · 11 pages, 4 figures submitted to Physical Review Letters

arxiv created 2004/12/21 · openalex publication_date 2005/02/07 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We report the direct observation of quantum coupling in individual quantum dot molecules and its manipulation using static electric fields. A pronounced anticrossing of different excitonic transitions is observed as the electric field is tuned. A comparison of our experimental results with theory shows that the observed anticrossing occurs between excitons with predominant spatially direct and indirect character and reveals a field driven transition of the nature of the molecular ground state exciton wave function. Finally, the interdot quantum coupling strength is deduced optically and its dependence on the interdot separation is calculated.

Citations

• Self-interaction correction to density-functional approximations for many-electron systems

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