Determination of the effective g-value of n-InAs by four-wave mixing spectroscopy

Spin resonant four-wave mixing of the radiation of two single frequency CO₂ lasers is observed in n-InAs. By this method the effective g-value of the material is determined in magnetic fields up to 6.5 T. The temperature of the sample is 1.5 K; the carrier concentration is 1.5 × 10¹⁶/cm³. The observed g-values lie between 14.7 at 0.5 T and 13.7 at 6.3 T and extrapolate to 15.0 at B = 0. We observed symmetric lineshapes at high magnetic fields with linewidths of the order of 1.3 kG corresponding to 0.9 cm^-1. At low magnetic fields the lines show an asymmetric shape with a steep decrease at the high field side of the resonance.