Brightening of dark excitons in a single quantum dot containing a single magnetic ion

摘要

A promising method to investigate dark exciton transitions in quantum dots ispresented. The optical recombination of the dark exciton is allowed when theexciton state is coupled with an individual magnetic impurity (manganese ion).It is shown that the efficient radiative recombination is possible when theexchange interaction with the magnetic ion is accompanied by a mixing of theheavy-light hole states related to an in-plane anisotropy of the quantum dot.It is also shown that the dark exciton recombination is an efficient channel ofmanganese spin orientation.