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Gershenzon, Ye. M.; Goltsman, G. N.; Yelantyev, A. I.; Petrova, Ye. B.; Ptitsina, N. G.; Filatov, V. S. |
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Lecture demonstrations of properties of superconductors and liquid helium |
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Year |
1987 |
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USSR Rept Phys. Math. JPRS UPM |
Abbreviated Journal |
USSR Rept Phys. Math. JPRS UPM |
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24 |
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7 |
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51 |
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Keywords |
demonstrations, lections |
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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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1704 |
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Gol'tsman, G. N.; Gusinskii, E. N.; Malyavkin, A. V.; Ptitsina, N. G.; Selevko, A. G.; Edel'shtein, V. M. |
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Title |
The excitonic Zeeman effect in uniaxially-strained germanium |
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Journal Article |
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Year |
1987 |
Publication |
Sov. Phys. JETP |
Abbreviated Journal |
Sov. Phys. JETP |
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Volume |
65 |
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6 |
Pages |
1233-1241 |
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Keywords |
Ge, Zeeman effect |
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We have carried out a high-resolution spectroscopic study of the absorption of submillimeter radiation by free excitons in germanium compressed along the [ 1 11 ] axis in a magnetic field parallel to the compression axis. In particular, we studied the splitting of the 1s- 2p transition in fields up to 6 kOe at T = 1.6 K, and observed a complex pattern in the Zeeman splitting which we believe is related to the effect of thermal motion of the excitons in a magnetic field on their internal structure (the magneto-Stark effect). The calculated submillimeter spectrum of excitons agrees with the experimental data. We predict that in a magnetic field the energy of the 2p, term is a minimum at a finite value of the exciton momentum perpendicular to the field-that is, the energy minimum forms a ring in momentum space. It follows that the density of states for this term must be a nonmonotonic function of the energy. A theory is developed of analogous phenomena in positronium. |
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1705 |
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Gershenzon, E. M.; Gol'tsman, G. N.; Ptitsina, N. G.; Riger, E. R. |
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Title |
Effect of electron-electron collisions on the trapping of free carriers by shallow impurity centers in germanium |
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Year |
1986 |
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Sov. Phys. JETP |
Abbreviated Journal |
Sov. Phys. JETP |
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64 |
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4 |
Pages |
889-897 |
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Keywords |
Ge, trapping of free carriers |
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Cascade Auger recombination of free carriers on shallow impurities in Ge is investigated under quasi-equilibrium conditions (T= 2-12 K) and in impurity breakdown. The Auger capture cross sections are found to be a,= 5. 10-l9 T-'n cm2 for donors and uip= 7- T-5p cm2 for acceptors. It is shown that in an isotropic semiconductor (p-Ge) ui is well described by the cascade-capture theory that takes into account only electron-electron collisions. In an anisotropic semiconductor ui is considerably larger (n-Ge, strongly uniaxially compressedp-Ge). Under impurity breakdown conditions the electron-electron collisions determine the lifetimes of the free carriers only in samples with appreciable density of the compensating impurity (Nk loi3 cmP3). |
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1707 |
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Gershenzon, E. M.; Gol'tsman, G. N.; Ptitsina, N. G. |
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Title |
Observation of the free-exciton spectrum at submillimeter wavelengths |
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1972 |
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JETP Lett. |
Abbreviated Journal |
JETP Lett. |
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16 |
Issue |
4 |
Pages |
161-162 |
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Keywords |
Ge, energy spectrum, free excitons |
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1736 |
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Gershenson, E. M.; Gol'tsman, G. N.; Elant'ev, A. I.; Kagane, M. L.; Multanovskii, V. V.; Ptitsina, N. G. |
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Title |
Use of submillimeter backward-wave tube spectroscopy in determination of the chemical nature and concentration of residual impurities in pure semiconductors |
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1983 |
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Sov. Phys. Semicond. |
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Sov. Phys. Semicond. |
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17 |
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8 |
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908-913 |
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Keywords |
BWO spectroscopy, pure semiconductors, residual impurities |
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Применение субмиллиметровой ЛОВ спектроскопии для определения химической природы и концентрации примесей в чистых полупроводниках |
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1714 |
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Gershenzon, E. M.; Goltsman, G. N.; Multanovskii, V. V.; Ptitsina, N. G. |
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Title |
Kinetics of submillimeter impurity and exciton photoconduction in Ge |
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1982 |
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Optics and Spectroscopy |
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Optics and Spectroscopy |
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52 |
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4 |
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454-455 |
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Ge, exciton photoconduction |
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1715 |
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Gershenzon, E. M.; Gol'tsman, G. N.; Multanovskii, V. V.; Ptitsina, N. G. |
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Title |
Cross section for binding of free carriers into excitons in germanium |
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Year |
1981 |
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JETP Lett. |
Abbreviated Journal |
JETP Lett. |
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33 |
Issue |
11 |
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574 |
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Ge, excitons, photoconductivity |
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1718 |
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Gershenzon, E. M.; Gol'tsman, G. N.; Ptitsina, N. G. |
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Title |
Population and lifetime of excited states of shallow impurities in Ge |
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1979 |
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Sov. Phys. JETP |
Abbreviated Journal |
Sov. Phys. JETP |
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49 |
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2 |
Pages |
355-362 |
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Keywords |
Ge, photothermal ionization, shallow impurities |
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An investigation was made of the dependences of the intensities of photothermal ionization lines of excited states of shallow impurities in Ge on the intensity of impurity-absorbed background radiation and on temperature. The results obtained were used to find the density and lifetime of carriers of lower excited states of the impurity centers. The lifetimes of the excited states of donors in Ge were 10-~-10-" sec and the lifetime of the lower excited state of acceptors was -lo-' sec. In the presence of background radiation the population of the excited states was very different from the equilibrium value and, in particular, a population inversion of the 2pk, state relative to the 3p0 and 3s states was observed. |
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1719 |
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Gershenzon, E.; Goltsman, G.; Orlov, L.; Ptitsina, N. |
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Title |
Population of excited-states of small admixtures in germanium |
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1978 |
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Izv. Akad. Nauk SSSR, Seriya Fizicheskaya |
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Izv. Akad. Nauk SSSR, Seriya Fizicheskaya |
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42 |
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6 |
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1154-1159 |
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Ge, excited states, admixtures |
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Mezhdunarodnaya Kniga 39 Dimitrova Ul., 113095 Moscow, Russia |
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1723 |
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Gershenzon, E. M.; Orlova, S. L.; Orlov, L. A.; Ptitsina, N. G.; Rabinovich, R. I. |
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Title |
Intervalley cyclotron-impurity resonance of electrons in n-Ge |
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1976 |
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JETP Lett. |
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JETP Lett. |
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24 |
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3 |
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125-128 |
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n-Ge, cyclotron-impurity resonance |
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1730 |
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