Gershenzon, E. M., Gol'tsman, G. N., & Ptitsina, N. G. (1973). Submillimeter spectroscopy of semiconductors. Sov. Phys. JETP, 37(2), 299–304.
Abstract: The possibility is considered of carrying out submillimeter-wave spectral investigations of semiconductors by means of a high resolution spectrometer with backward-wave tubes. Results of a study of the excitation spectra of small impurities, D-(A +) centers and free excitons in germanium are presented.
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Verevkin, A. A., Ptitsina, N. G., Smirnov, K. V., Voronov, B. M., Gol’tsman, G. N., Gershenson, E. M., et al. (1999). Multiple Andreev reflection in hybrid AlGaAs/GaAs structures with superconducting NbN contacts. Semicond., 33(5), 551–554.
Abstract: The conductivity of hybrid microstructures with superconducting contacts made of niobium nitride to a semiconductor with a two-dimensional electron gas in a AlGaAs/GaAs heterostructure has been investigated. Distinctive features of the behavior of the conductivity indicate the presence of multiple Andreev reflection at scattering centers in the normal region near the superconductor-semiconductor boundary.
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Gershenzon, E. M., Gol'tsman, G. N., Multanovskii, V. V., & Ptitsina, N. G. (1981). Cross section for binding of free carriers into excitons in germanium. JETP Lett., 33(11), 574.
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Gershenzon, Y. M., Goltsman, G. N., Yelantyev, A. I., Petrova, Y. B., Ptitsina, N. G., & Filatov, V. S. (1987). Lecture demonstrations of properties of superconductors and liquid helium. USSR Rept Phys. Math. JPRS UPM, 24(7), 51.
Abstract: New demonstrations for low temperature physics courses are described. Two transparent Dewar vacuum flasks fitting one inside the other with the external flask for nitrogen and the internal flask for helium are used. The helium temperature can be regulated in the 4.2 to 1.6 K range and the effects of reducing helium to the superfluid state at 2.17 K can be shown: boiling abruptly stops and superfluid flow appears. In order to show the electric and magnetic characteristics of superconductivity, a superconducting NbTi solenoid containing nonsuperconducting wire and germanium and superconducting Nb materials with different critical temperatures is placed in the helium refrigerant vessel. The fall of the resistance at the critical temperatures can be shown. In order to show magnetic field and superconductive current flow properties a shunt of superconductive material is connected in parallel to the coil and is enclosed in a teflon container with a heater which can vary its temperature. When it is heated and not superconductive, magnetic field effects can be demonstrated and when it is unheated and superconducting a continuous current can be demonstrated.
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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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