Origin of the oscillator strength of the triplet state of a trion in a magnetic field.
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.
Sanvitto
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Cavendish Laboratory, University of Cambridge, Madingley Road, United Kingdom.
Whittaker
D M
DM
Shields
A J
AJ
Simmons
M Y
MY
Ritchie
D A
DA
Pepper
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M