The properties of photo-generated carriers in pure germanium have been studied by means of magneto-absorptions of far-infrared laser radiations. Remarkable variations of the spectra with temperature are ascribed to the phase transition of free excitons into electron hole drops (EHD). An attempt has been made to establish a correspondence between the exciton Zeeman lines and the cyclotron resonance lines in the quantum limit on the basis of an adiabatic picture for the Coulomb interaction. Resonance effects of EHD are discussed using Mie's theory and compared with observed results. A non-resonant oscillation of the EHD absorption against magnetic field has been observed, which allows us to estimate the equilibrium carrier density of EHD.
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Muro et al. (1976) studied this question.
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