title: Origin of the oscillator strength of the triplet state of a trion in a magnetic field.
abstract: The dynamics of the spin-triplet trion state, under high magnetic field in a GaAs/AlGaAs quantum well, are studied using time resolved spectroscopy. The oscillator strength of the triplet transition is shown to rise with increasing electron density, in good agreement with a theoretical model where the trion interacts with excess electrons in the quantum well. This analysis suggests that the spin-triplet trion state, which is expected to be an optically "dark" state, is experimentally observable due to the interactions with the excess electrons, demonstrating that X- cannot be regarded as an isolated three particle complex.
authors.affiliation: Cavendish Laboratory, University of Cambridge, Madingley Road, United Kingdom.
authors.forename: D
authors.initials: D
authors.lastname: Sanvitto
authors.forename: D M
authors.initials: DM
authors.lastname: Whittaker
authors.forename: A J
authors.initials: AJ
authors.lastname: Shields
authors.forename: M Y
authors.initials: MY
authors.lastname: Simmons
authors.forename: D A
authors.initials: DA
authors.lastname: Ritchie
authors.forename: M
authors.initials: M
authors.lastname: Pepper