We report on the magnetic field dispersion of the exciton spin-splitting and diamagnetic shift in single InAs/GaAs quantum dots (QDs) and dot molecules (QDMs) up to B = 28 T. Only for systems with strong geometric confinement, the dispersions can be well described by simple field dependencies, while for dots with weaker confinement considerable deviations are observed: most importantly, in the high field limit the spin-splitting shows a non-linear dependence on B, clearly indicating light hole admixtures to the valence band ground state.
@article{arxiv.cond-mat/0503271,
title = {Non-linear exciton spin-splitting in single InAs/GaAs self-assembled quantum structures in ultrahigh magnetic fields},
author = {A. Babinski and G. Ortner and S. Raymond and M. Potemski and M. Bayer and P. Hawrylak and A. Forchel and Z. Wasilewski and S. Fafard},
journal= {arXiv preprint arXiv:cond-mat/0503271},
year = {2009}
}