1. Coulomb mediated hybridization of excitons in artificial molecules
- Author
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Ardelt, P. -L., Gawarecki, K., Müller, K., Waeber, A. M., Bechtold, A., Oberhofer, K., Daniels, J. M., Klotz, F., Bichler, M., Kuhn, T., Krenner, H. J., Machnikowski, P., Abstreiter, G., and Finley, J. J.
- Subjects
Condensed Matter - Mesoscale and Nanoscale Physics - Abstract
We report the Coulomb mediated hybridization of excitonic states in an optically active, artificial quantum dot molecule. By probing the optical response of the artificial molecule as a function of the static electric field applied along the molecular axis, we observe unexpected avoided level crossings that do not arise from the dominant single particle tunnel coupling. We identify a new few-particle coupling mechanism stemming from Coulomb interactions between different neutral exciton states. Such Coulomb resonances hybridize the exciton wave function over four different electron and hole single-particle orbitals. Comparisons of experimental observations with microscopic 8-band $k \cdot p$ calculations taking into account a realistic quantum dot geometry show good agreement and reveal that the Coulomb resonances arise from broken symmetry in the artificial molecule.
- Published
- 2015
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