Influence of the electron-electron and electron-phonon interaction on the cyclotron resonance of 2DEG in GaAs

The resonant polaron effect was investigated for cyclotron transitions N-> N + 1 in magnetic field regimes where the Landau levels N = 2 and 3 cross with the level N = 0 plus one bulk longitudinal optical phonon. The experiment is analyzed in the framework of the improved Wigner-Brillouin perturbation theory taking into account band-coupling phenomena, a finite thickness of the inversion layer in the growth direction, and coupling of the cyclotron transitions due to electron-electron interactions. From the cyclotron mass enhancements, a Fröhlich coupling constant alpha = 0.06 to 0.07 was obtained.