In semiconductor quantum dots the coupling to the environment, i.e. to phonons, plays a crucial role for optical state preparation. We analyze the phonon impact on two methods for a direct optical preparation of the dark exciton, which is enabled by a tilted magnetic field: the excitation with a chirped laser pulse and the excitation with a detuned pulse. Our study reveals that for both methods phonons either do not impede the proposed mechanism or are even useful by widening the parameter range where a dark state preparation is possible due to phonon-assisted dark exciton preparation. In view of the positive impact of phonons on the optical preparation the use of dark excitons in quantum dots becomes even more attractive.
@article{arxiv.1704.03792,
title = {Phonon-assisted dark exciton preparation in a quantum dot},
author = {Sebastian Lüker and Tilmann Kuhn and Doris E. Reiter},
journal= {arXiv preprint arXiv:1704.03792},
year = {2017}
}