Interband magneto-optical absorption in gallium arsenide

Abstract

Interband magneto-optical absorption measurements have been performed on GaAs in magnetic fields up to 98 kOe, for H parallel to [100] and [111] directions and for σ +, σ − and π polarized radiation at 2°K, 77°K and room temperature. The transition energies, corrected for Coulomb binding effects, are analysed in terms of the theory developed for germanium by Roth et al. Apart from a slight anomaly in the energy of the | a+ > light hole level, the spectra are isotropic and do not show effects due to the lack of inversion symmetry in GaAs. At 77°K the electron mass at the bottom of the band is found as m e = (0·067 ± 0·002) m. For the light and heavy hole masses we arrive at m th = (0·082 ± 0·006) m, m hh = (0·45 ± 0·05) m. The same values hold at 2°K and slightly smaller values hold at room temperature.