INFLUENCE 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 c ross with the level N=0 plus one bulk longitudinal optical phonon. The experiment is analyzed in the framework oi the improved Wigner-Brillo uin 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 interac tions. From the cyclotron mass enhancements, a Frohlich coupling const ant alpha=0.06 to 0.07 was obtained.