MAGNETIC-FIELD DEPENDENCE OF THE ELECTRON-LO-PHONON INTERACTION IN A 2D ELECTRON-GAS

The intensities of the circularly polarized luminescence of the radiat ive recombination between two-dimensional electrons and bound holes an d of its longitudinal optic (LO) phonon lear-energy sideband have been investigated at low temperatures of about 100 mK as a function of the magnetic field. These replica reproduce exactly the main magneto-lumi nescence spectra including the singularities specific for the gaps rel ated to the integer and the fractional quantum hall states. a model wi thout any adjustable parameter is proposed to explain the results and reproduces semi-quantitatively the observed variation.