Internal spin-singlet and spin-triplet transitions of charged excitons X- in magnetic fields in quantum wells have been studied experimentally and theoretically. The allowed X- transitions are photoionizing and exhibit a characteristic double-peak structure, which reflects the rich structure of the magnetoexciton continua in higher Landau levels (LL's). We discuss a novel exact selection rule, a hidden manifestation of translational invariance, that governs transitions of charged mobile complexes in a magnetic field.
@article{arxiv.cond-mat/9907124,
title = {Internal Transitions of Two-Dimensional Charged Magneto-Excitons X-: Theory and Experiment},
author = {A. B. Dzyubenko and A. Yu. Sivachenko and H. A. Nickel and T. M. Yeo and G. Kioseoglou and B. D. McCombe and A. Petrou},
journal= {arXiv preprint arXiv:cond-mat/9907124},
year = {2009}
}