Raman probing of the wave function of collective excitations in the presence of disorder

The spatial extents of the wave functions of the collective plasmon–LO phonon excitations were studied as a function of the doping concentration and the temperature in the AlGaAs alloy. A strong increase of the localization length was found with the increase of doping, while a decrease of the locali...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2001-12, Vol.308, p.772-775
Main Authors: Pusep, Yu.A., Sokolov, S.S., Fortunato, W., Galzerani, J.C., Leite, J.R.
Format: Article
Language:English
Subjects:
AlGaAs alloys
Localization
Plasmons
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Summary:The spatial extents of the wave functions of the collective plasmon–LO phonon excitations were studied as a function of the doping concentration and the temperature in the AlGaAs alloy. A strong increase of the localization length was found with the increase of doping, while a decrease of the localization length was detected with the increase of the doping level at higher electron densities. A theoretical analysis based on the variational principle showed that the ionized impurities are responsible for the observed decrease of the localization length.
ISSN:0921-4526
1873-2135
DOI:10.1016/S0921-4526(01)00835-3