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Gershenzon, E. M., Goltsman, G. N., & Orlov, L. (1976). Investigation of population and ionization of donor excited states in Ge. In Physics of Semiconductors (pp. 631–634). North-Holland Publishing Co.
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Gershenzon, E. M., Gol'tsman, G. N., & Ptitsina, N. G. (1976). Investigation of free excitons in Ge and their condensation at submillimeter wavelengths. Sov. Phys. JETP, 43(1), 116–122.
Abstract: Results are presented of an investigation of free excitons in Ge in the submillimeter wavelength range for low as well as for high excitation levels when interaction between the excitons becomes important. The free-exciton energy spectrum is discussed. It is shown that the drop radii and their concentrations can be determined by measuring the temperature dependence of the free-exciton concentration. A section of the phase diagram is obtained in the 0.5-2.8 K temperature range for the free excitons+condensate system.
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Gershenzon, E. M., Orlova, S. L., Orlov, L. A., Ptitsina, N. G., & Rabinovich, R. I. (1976). Intervalley cyclotron-impurity resonance of electrons in n-Ge. JETP Lett., 24(3), 125–128.
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Blagosklonskaya, L. E., Gershenzon, E. M., Gol'tsman, G. N., & Elant'ev, A. I. (1977). Effect of a high magnetic field on the spectrum of donors in InSb. Fizika i Tekhnika Poluprovodnikov, 11(12), 2373–2375.
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Gershenzon, E. M., Gol'tsman, G. N., & Elant'ev, A. I. (1977). Energy spectrum of the donors in GaAs and Ge and its reaction to a magnetic field. Sov. Phys. JETP, 45(3), 555–565.
Abstract: The spectrum of the submillimeter photoconductivity of n-GaAs and n-Ge in a magnetic field up to 60 kOe at helium temperatures was investigated. A large number of lines due to transitions between excited states of the donors have been investigated, and the measurement results were used to determine a number of levels of the energy spectrum in a wide range of magnetic fields. For GaAs, these data are compared with calculations of the energy spectrum of the hydrogen atom in magnetic fields up to -2X lo9 Oe. For the donors in Ge, the energy spectrum is investigated at different orientations of the magnetic field relative to the crystallographic axes (H 11 [loo], [I 1 I], [110]), and these results are also compared with the corresponding calculations.
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