Coulomb mediated hybridization of excitons in artificial molecules
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 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.
Keywords
Cite
@article{arxiv.1509.08670,
title = {Coulomb mediated hybridization of excitons in artificial molecules},
author = {P. -L. Ardelt and K. Gawarecki and K. Müller and A. M. Waeber and A. Bechtold and K. Oberhofer and J. M. Daniels and F. Klotz and M. Bichler and T. Kuhn and H. J. Krenner and P. Machnikowski and G. Abstreiter and J. J. Finley},
journal= {arXiv preprint arXiv:1509.08670},
year = {2016}
}