Infrared magnetospectroscopy of GaAs at magnetic fields up to 150 T

Abstract

A study of the nonparabolic and anisotropic nature of the ${\ensuremath{\Gamma}}_{6}$ conduction band of GaAs is presented for magnetic fields up to 150 T. Spin splitting of the cyclotron resonance and donor-shifted cyclotron-resonance transitions are observed in the transmission spectra. A five-level P\ensuremath{\cdot}p model that includes resonant and nonresonant polaron effects is developed and compared to experiment. Reasonable agreement between theory and experiment is found.