The nonparabolicity of the conduction band and the anisotropy of the hot electron distribution function have been shown to lead to the anisotropy of the refraction index in strong electric fields (Kerr effect). Nonparabolicity causes also a decrease of the Faraday rotation angle 6 when the electron gas is heated. A comparison of the calculated values of A 8 with the experimental ones allows to determine the temperature of hot electrons for n-type InSb with concentrations of the electrons in the range of 3 x 1014 to 4.9 x 1015 cm-3 a t To = 80 O K in longitudinal magnetic fields. The interaction constant with polar optical phonons was also determined. The influence of e-e collisions on the distribution function of hot electrons is discussed.
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