Ov. Volkov et al., EXCITONIC EFFECTS IN THE RECOMBINATION RADIATION SPECTRA OF COMPLETELY FILLED LANDAU-LEVELS OF 2-DIMENSIONAL ELECTRONS, JETP letters, 65(1), 1997, pp. 38-44
The recombination radiation spectra of two-dimensional electrons in an
asymmetrically doped GaAs/AlGaAs quantum well are investigated at dif
ferent temperatures and laser-excitation energies. At low temperatures
and in high magnetic fields the recombination lines of the electrons
from completely filled Landau levels are split into narrow sublevels.
It is shown that this fine structure of the Landau levels is due to th
e presence of excitonic effects in the initial and final states of the
photoexcited system. it is demonstrated that the recombination proces
s is accompanied by the excitation of intersubband and cyclotron magne
toplasma modes. (C) 1997 American Institute of Physics.