Diffusion of free trions in mixed-type [formula omitted] quantum wells

We show that an emission line which depends on the simultaneous presence of excitons and < 2 × 10 10cm −2 electrons in a 20 nm GaAs quantum well is due to free negatively charged excitons or ‘trions’. Using time- and spatially-resolved photoluminescence, we find that trions and excitons are local...

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Bibliographic Details
Published in:Journal of luminescence 1997-06, Vol.72, p.302-304
Main Authors: Yoon, H.W., Sturge, M.D., Ron, Arza, Pfeiffer, L.N.
Format: Article
Language:English
Subjects:
Diffusion
Quantum wells
Trions
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Summary:We show that an emission line which depends on the simultaneous presence of excitons and < 2 × 10 10cm −2 electrons in a 20 nm GaAs quantum well is due to free negatively charged excitons or ‘trions’. Using time- and spatially-resolved photoluminescence, we find that trions and excitons are localized at 5 K, and with increasing bath temperature both species become mobile. The diffusivity of trions and excitons increases linearly with bath temperature, and the trion mobility is found to be about one-half the exciton mobility.
ISSN:0022-2313
1872-7883
DOI:10.1016/S0022-2313(97)00056-2