The photoluminescence spectrum of a single quantum dot was recorded as a secondary resonant laser optically dressed either the vacuum-to-exciton or the exciton-to-biexciton transitions. High-resolution polarization-resolved measurements using a scanning Fabry-Perot interferometer reveal splittings of the linearly-polarized fine-structure states that are non-degenerate in an asymmetric quantum dot. These splittings manifest as either triplets or doublets and depend sensitively on laser intensity and detuning. Our approach realizes complete resonant control of a multi-excitonic system in emission, which can be either pulsed or continuous-wave, and offers direct access to the emitted photons.
@article{arxiv.0807.0043,
title = {Emission spectrum of a dressed exciton-biexciton complex in a semiconductor quantum dot},
author = {Andreas Muller and Wei Fang and John Lawall and Glenn S. Solomon},
journal= {arXiv preprint arXiv:0807.0043},
year = {2009}
}