Abstract
A comprehensive magneto-optical study of the light-hole valence band of InSb-NiSb eutectic is presented. Transmission spectra in the Faraday geometry are measured in the spectral region below 350 cm−1 and at the CO2 laser frequency of 933 cm−1. Temperature dependence (from 1.2 to 80 K) and magnetic fields (from zero field to 350 kG) are used to interpret the experimental data. Transitions among acceptor impurity levels are observed in the zero magnetic-field spectra. With an applied magnetic field, intravalence band transitions and transitions from acceptor levels to the valence band are observed. The Luttinger coefficients of the valence band as calculated from the effective masses of the acceptor level to valence-band transitions are γL1 = 30.9, γ̄L = 15.3, and KL = 12.9. From the zero-field positions of the transitions, the ground-state acceptor level is determined to be 83±3 cm−1 above the top of the valence band. Bound hole-phonon coupling is observed in the pinning behavior and nonlinear field dependence of the acceptor to valence-band transitions. Free hole-phonon coupling is observed for the first time in the nonlinear field dependence of the intraband transitions.
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