In two-beam magneto-photoluminescence spectra of a two-dimensional valence hole gas we identify the three-level energy spectrum of a free positive trion with a field-induced singlet-triplet transition. The recombination spectrum of acceptor-bound trions is also detected, including a cyclotron replica corresponding to the hole shake-up process. The emergence of a shake-up peak at low temperature is shown to be a sensitive probe of the presence of a small number of impurities inside the high-mobility quantum well, and its relative position is directly related to the hole cyclotron mass.
@article{arxiv.cond-mat/0610158,
title = {Magneto-optical probing of weak disorder in a two-dimensional hole gas},
author = {Leszek Bryja and Arkadiusz Wojs and Jan Misiewicz and Marek Potemski and Dirk Reuter and Andreas Wieck},
journal= {arXiv preprint arXiv:cond-mat/0610158},
year = {2015}
}