Abstract
The oscillatory Faraday and Voigt spectra observed by Nishina and Lax near the direct band gap of germanium have been analysed on the effective mass theory of the excitons in a strong magnetic field. The effective mass equation is solved variationally and assignment of each rotational singularity is made. The exciton binding turns out to be essential for the interpretation of the rotation spectra at room temperature as well as at low temperature. The effect of the existing strain is emphasized in the low temperature spectrum. The sign reversal of the first Faraday singularity observed at low temperatures is accounted for as an interplay between the effects of strain and magnetic field on a degenerate band.
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