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Screening of excitonic states by low-density 2D charge carriers in GaAs/AlGaAs quantum wells

Gubarev, S. I. ; Kukushkin, I. V. ; Tovstonog, S. V. ; Akimov, M. Yu. ; Smet, J. H. ; Klitzing, Klaus von ; Wegscheider, Werner
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Date of publication of this fulltext: 30 Nov 2009 13:31


Abstract

Screening of excitonic states by a system of 2D electrons (or holes) in GaAs/AlGaAs single quantum wells is studied. With increasing concentration of 2D charge carriers, a threshold-type disappearance of excitonic states is observed in both luminescence and reflectance spectra. The higher the quality of the 2D system, the lower the corresponding threshold concentration. In the best systems, the ...

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