Photovoltaic effect and interband magneto-optical transitions in InP

A study is made of the oscillatory spectral distribution of the photovoltaic (PV) effect of a gold-indium phosphide Schottky barrier in magnetic fields of up to 70 kG. Spectra are obtained for both the direct and wavelength-modulated PV signals, the latter being compared to the wavelength-modulated reflectivity data. The spectra are taken at 4.2 K in the Faraday configuration for both circular polarizations. The transition energies associated with the spectral oscillations are corrected for exciton-binding effects, and are analyzed as Landau levels in terms of the Pidgeon and Brown coupled-bands theory of interband magnetoabsorption. The fit to the data gives a conduction-band effective mass mcm₀=0.079±0.001 and Luttinger parameters γ₁L=5.15±0.05, γ₂L=0.94±0.03, and γ₃L=1.62±0.03. The direct observation of the split-off valence-band-to-conduction-band transition gives Δ₀=0.108±0.003 eV and an approximate effective mass of mₛₒm₀=0.21±0.02.