Infrared Faraday rotation ofn-type InSb

The Faraday rotation of n-type InSb has been measured for wavelengths between 8.0 and 13.0 μm at 9 K, using magnetic fields up to 150 kG. Measurements were made on samples with nominal carrier concentration of 1×${10}^{14}$, 6×${10}^{14}$, 1×${10}^{15}$, and 5×${10}^{15}$ ${\mathrm{cm}}^{\mathrm{-}3}$. The experimental results have been successfully analyzed in terms of interband and intraband transitions at the Γ point in the Brillouin zone, using a quantum-mechanical treatment. The four-band k⋅p Pidgeon and Brown model was used to calculate the energy levels and the matrix elements for these transitions.