| Records |
| Author |
Tikhonov, V. V.; Boyarskii, D. A.; Polyakova, O. N.; Dzardanov, A. L.; Goltsman, G. N. |
| Title |
Radiophysical and dielectric properties of ore minerals in 12--145 GHz frequency range |
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Journal Article |
| Year |
2010 |
Publication |
PIER B |
Abbreviated Journal |
PIER B |
| Volume |
25 |
Issue |
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Pages |
349-367 |
Keywords  |
complex permittivity, ore minerals |
| Abstract |
The paper discusses a retrieval technique of complex permittivity of ore minerals in frequency ranges of 12--38 GHz and 77--145 GHz. The method is based on measuring frequency dependencies of transmissivity and reflectivity of plate-parallel mineral samples. In the 12--38 GHz range, the measurements were conducted using a panoramic standing wave ratio and attenuation meter. In the 77--145 GHz range, frequency dependencies of transmissivity and reflectivity were obtained using millimeter-band spectrometer with backward-wave oscillators. The real and imaginary parts of complex permittivity of a mineral were determined solving an equation system for frequency dependencies of transmissivity and reflectivity of an absorbing layer located between two dielectric media. In the course of the work, minerals that are primary ores in iron, zinc, copper and titanium mining were investigated: magnetite, hematite, sphalerite, chalcopyrite, pyrite, and ilmenite. |
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RPLAB @ gujma @ |
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639 |
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Gershenzon, Ye. M.; Goltsman, G. N.; Yelantyev, A. I.; Petrova, Ye. B.; Ptitsina, N. G.; Filatov, V. S. |
| Title |
Lecture demonstrations of properties of superconductors and liquid helium |
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Journal Article |
| Year |
1987 |
Publication |
USSR Rept Phys. Math. JPRS UPM |
Abbreviated Journal |
USSR Rept Phys. Math. JPRS UPM |
| Volume |
24 |
Issue |
7 |
Pages |
51 |
| Keywords |
demonstrations, lections |
| 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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1704 |
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Tretyakov, I.; Svyatodukh, S.; Perepelitsa, A.; Ryabchun, S.; Kaurova, N.; Shurakov, A.; Smirnov, M.; Ovchinnikov, O.; Goltsman, G. |
| Title |
Ag2S QDs/Si heterostructure-based ultrasensitive SWIR range detector |
Type |
Journal Article |
| Year |
2020 |
Publication |
Nanomaterials (Basel) |
Abbreviated Journal |
Nanomaterials (Basel) |
| Volume |
10 |
Issue |
5 |
Pages |
1-12 |
| Keywords |
detector; quantum dots; short-wave infrared range; silicon |
| Abstract |
In the 20(th) century, microelectronics was revolutionized by silicon-its semiconducting properties finally made it possible to reduce the size of electronic components to a few nanometers. The ability to control the semiconducting properties of Si on the nanometer scale promises a breakthrough in the development of Si-based technologies. In this paper, we present the results of our experimental studies of the photovoltaic effect in Ag2S QD/Si heterostructures in the short-wave infrared range. At room temperature, the Ag2S/Si heterostructures offer a noise-equivalent power of 1.1 x 10(-10) W/ radicalHz. The spectral analysis of the photoresponse of the Ag2S/Si heterostructures has made it possible to identify two main mechanisms behind it: the absorption of IR radiation by defects in the crystalline structure of the Ag2S QDs or by quantum QD-induced surface states in Si. This study has demonstrated an effective and low-cost way to create a sensitive room temperature SWIR photodetector which would be compatible with the Si complementary metal oxide semiconductor technology. |
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Laboratory of nonlinear optics, Zavoisky Physical-Technical Institute of the Russian Academy of Sciences, Kazan 420029, Russia |
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English |
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2079-4991 |
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PMID:32365694; PMCID:PMC7712218 |
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1151 |
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Семенов, А. В.; Корнеев, А. А.; Смирнов, А. В.; Смирнов, К. В.; Ожегов, Р. В.; Окунев, О. В.; Гольцман, Г. Н.; Девятов, И. А. |
| Title |
Линейные по мощности поглощаемого излучения поправки к спектральным функциям «грязного» сверхпроводника и отклик сверхпроводниковых детекторов |
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Journal Article |
| Year |
2012 |
Publication |
Преподаватель ХХI век |
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Issue |
3 |
Pages |
216-220 |
| Keywords |
dirty superconductor film |
| Abstract |
В статье развит метод расчета малых поправок к спектральным функциям пленки «грязного» сверхпроводника, возникающих под действием поглощаемой мощности электромагнитного излучения. Метод пригоден в случае спектральных функций произвольного вида, что позволяет применять его для расчета отклика сверхпроводниковых детекторов излучения различного типа. |
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no |
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1822 |
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Semenov, A. V.; Devyatov, I. A.; Korneev, A. A.; Smirnov, K. V.; Goltsman, G. N.; Melnikov, A. P. |
| Title |
Derivation of expression for thermodynamic potential of “dirty” superconductor |
Type |
Journal Article |
| Year |
2012 |
Publication |
Rus. J. Radio Electron. |
Abbreviated Journal |
Rus. J. Radio Electron. |
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Issue |
4 |
Pages |
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| Keywords |
dirty superconductor, Usadel theory, thermodynamic potential |
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We derive a formula for thermodynamic potential of dirty superconductor which express it via isotropic quasiclassical Green functions of Usadel theory. Our result allows unify description of dynamic processes and fluctuations in superconducting nano-electronic devices. |
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Russian |
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7 pages |
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no |
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1824 |
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Sergeev, A.; Karasik, B. S.; Ptitsina, N. G.; Chulkova, G. M.; Il'in, K. S.; Gershenzon, E. M. |
| Title |
Electron–phonon interaction in disordered conductors |
Type |
Journal Article |
| Year |
1999 |
Publication |
Phys. Rev. B Condens. Matter |
Abbreviated Journal |
Phys. Rev. B Condens. Matter |
| Volume |
263-264 |
Issue |
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Pages |
190-192 |
| Keywords |
disordered conductors, electron-phonon interaction |
| Abstract |
The electron–phonon interaction is strongly modified in conductors with a small value of the electron mean free path (impure metals, thin films). As a result, the temperature dependencies of both the inelastic electron scattering rate and resistivity differ significantly from those for pure bulk materials. Recent complex measurements have shown that modified dependencies are well described at K by the electron interaction with transverse phonons. At helium temperatures, available data are conflicting, and cannot be described by an universal model. |
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0921-4526 |
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no |
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Serial |
1765 |
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Sergeev, A.; Mitin, V. |
| Title |
Electron-phonon interaction in disordered conductors: Static and vibrating scattering potentials |
Type |
Journal Article |
| Year |
2000 |
Publication |
Phys. Rev. B. |
Abbreviated Journal |
Phys. Rev. B. |
| Volume |
61 |
Issue |
9 |
Pages |
6041-6047 |
| Keywords |
disordered conductors, scattering potential, electron-phonon interaction |
| Abstract |
Employing the Keldysh diagram technique, we calculate the electron-phonon energy relaxation rate in a conductor with the vibrating and static δ-correlated random electron-scattering potentials. If the scattering potential is completely dragged by phonons, this model yields the Schmid’s result for the inelastic electron-scattering rate τ−1e−ph. At low temperatures the effective interaction decreases due to disorder, and τ−1e−ph∝T4l (l is the electron mean-free path). In the presense of the static potential, quantum interference of numerous scattering processes drastically changes the effective electron-phonon interaction. In particular, at low temperatures the interaction increases, and τ−1e−ph∝T2/l. Along with an enhancement of the interaction, which is observed in disordered metallic films and semiconducting structures at low temperatures, the suggested model allows us to explain the strong sensitivity of the electron relaxation rate to the microscopic quality of a particular film. |
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Edition |
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0163-1829 |
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no |
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307 |
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Ptitsina, N. G.; Chulkova, G. M.; Il’in, K. S.; Sergeev, A. V.; Pochinkov, F. S.; Gershenzon, E. M.; Gershenson, M. E. |
| Title |
Electron-phonon interaction in disordered metal films: The resistivity and electron dephasing rate |
Type |
Journal Article |
| Year |
1997 |
Publication |
Phys. Rev. B |
Abbreviated Journal |
Phys. Rev. B |
| Volume |
56 |
Issue |
16 |
Pages |
10089-10096 |
| Keywords |
disordered metal films, electron-phonon interaction, electron dephasing rate, resistivity |
| Abstract |
The temperature dependence of the resistance of films of Al, Be, and NbC with small values of the electron mean free path l=1.5–10nm has been measured at 4.2–300 K. The resistance of all the films contains a T2 contribution that is proportional to the residual resistance; this contribution has been attributed to the interference between the elastic electron scattering and the electron-phonon scattering. Fitting the data to the theory of the electron-phonon-impurity interference (M. Yu. Reiser and A. V. Sergeev, Zh. Eksp. Teor. Fiz. 92, 224 (1987) [Sov. Phys. JETP 65, 1291 (1987)]), we obtain constants of interaction of the electrons with transverse phonons, and estimate the contribution of this interaction to the electron dephasing rate in thin films of Au, Al, Be, Nb, and NbC. Our estimates are in a good agreement with the experimental data on the inelastic electron-phonon scattering in these films. This indicates that the interaction of electrons with transverse phonons controls the electron-phonon relaxation rate in thin-metal films over a broad temperature range. |
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0163-1829 |
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no |
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1766 |
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Kardakova, A.; Finkel, M.; Morozov, D.; Kovalyuk, V.; An, P.; Dunscombe, C.; Tarkhov, M.; Mauskopf, P.; Klapwijk, T.M.; Goltsman, G. |
| Title |
The electron-phonon relaxation time in thin superconducting titanium nitride films |
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Journal Article |
| Year |
2013 |
Publication |
Appl. Phys. Lett. |
Abbreviated Journal |
Appl. Phys. Lett. |
| Volume |
103 |
Issue |
25 |
Pages |
252602 (1 to 4) |
| Keywords |
disordered TiN films, electron-phonon relaxation time |
| Abstract |
We report on the direct measurement of the electron-phonon relaxation time, τeph, in disordered TiN films. Measured values of τeph are from 5.5 ns to 88 ns in the 4.2 to 1.7 K temperature range and consistent with a T−3 temperature dependence. The electronic density of states at the Fermi level N0 is estimated from measured material parameters. The presented results confirm that thin TiN films are promising candidate-materials for ultrasensitive superconducting detectors.
The work was supported by the Ministry of Education and Science of the Russian Federation, Contract No. 14.B25.31.0007 and by the RFBR Grant No. 13-02-91159. |
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RPLAB @ kovalyuk @ |
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941 |
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Gershenzon, E.M.; Gol'tsman, G.N.; Dzardanov, A.L.; Kuznetsov, E.A. |
| Title |
Superconducting UHF-limiter based on electron heating up |
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Journal Article |
| Year |
1992 |
Publication |
Sverkhprovodimost': Fizika, Khimiya, Tekhnika |
Abbreviated Journal |
Sverkhprovodimost': Fizika, Khimiya, Tekhnika |
| Volume |
5 |
Issue |
11 |
Pages |
2164-2170 |
| Keywords |
electron heating, applications |
| Abstract |
The results of experimental investigation of fast-action 5HF-limiter are presented; the limiter is based on the utilization of electron hetaing phenomenon in thin superconducting films. The design of SHF-limiter, which is intended for operation at liquid helium temperatures and which has the form of a section of superconducting NbN microstrip line for 1-12 GHz rang, is described. |
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Russian |
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0235-8964 |
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no |
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1669 |
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Saveskul, N. A.; Titova, N. A.; Baeva, E. M.; Semenov, A. V.; Lubenchenko, A. V.; Saha, S.; Reddy, H.; Bogdanov, S. I.; Marinero, E. E.; Shalaev, V. M.; Boltasseva, A.; Khrapai, V. S.; Kardakova, A. I.; Goltsman, G. N. |
| Title |
Superconductivity behavior in epitaxial TiN films points to surface magnetic disorder |
Type |
Journal Article |
| Year |
2019 |
Publication |
Phys. Rev. Applied |
Abbreviated Journal |
Phys. Rev. Applied |
| Volume |
12 |
Issue |
5 |
Pages |
054001 |
| Keywords |
epitaxial TiN films |
| Abstract |
We analyze the evolution of the normal and superconducting properties of epitaxial TiN films, characterized by high Ioffe-Regel parameter values, as a function of the film thickness. As the film thickness decreases, we observe an increase of the residual resistivity, that becomes dominated by diffusive surface scattering for d≤20nm. At the same time, a substantial thickness-dependent reduction of the superconducting critical temperature is observed compared to the bulk TiN value. In such high-quality material films, this effect can be explained by a weak magnetic disorder residing in the surface layer with a characteristic magnetic defect density of approximately 1012cm−2. Our results suggest that surface magnetic disorder is generally present in oxidized TiN films. |
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2331-7019 |
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no |
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1166 |
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Gayduchenko, I.; Xu, S. G.; Alymov, G.; Moskotin, M.; Tretyakov, I.; Taniguchi, T.; Watanabe, K.; Goltsman, G.; Geim, A. K.; Fedorov, G.; Svintsov, D.; Bandurin, D. A. |
| Title |
Tunnel field-effect transistors for sensitive terahertz detection |
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Journal Article |
| Year |
2021 |
Publication |
Nat. Commun. |
Abbreviated Journal |
Nat. Commun. |
| Volume |
12 |
Issue |
1 |
Pages |
543 |
| Keywords |
field-effect transistors, bilayer graphene, BLG |
| Abstract |
The rectification of electromagnetic waves to direct currents is a crucial process for energy harvesting, beyond-5G wireless communications, ultra-fast science, and observational astronomy. As the radiation frequency is raised to the sub-terahertz (THz) domain, ac-to-dc conversion by conventional electronics becomes challenging and requires alternative rectification protocols. Here, we address this challenge by tunnel field-effect transistors made of bilayer graphene (BLG). Taking advantage of BLG's electrically tunable band structure, we create a lateral tunnel junction and couple it to an antenna exposed to THz radiation. The incoming radiation is then down-converted by the tunnel junction nonlinearity, resulting in high responsivity (>4 kV/W) and low-noise (0.2 pW/[Formula: see text]) detection. We demonstrate how switching from intraband Ohmic to interband tunneling regime can raise detectors' responsivity by few orders of magnitude, in agreement with the developed theory. Our work demonstrates a potential application of tunnel transistors for THz detection and reveals BLG as a promising platform therefor. |
| Address |
Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA. bandurin@mit.edu |
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English |
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2041-1723 |
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PMID:33483488; PMCID:PMC7822863 |
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no |
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1261 |
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Gershenzon, E. M.; Goltsman, G. N.; Ptitsyna, N. G. |
| Title |
Investigation of excited donor states in GaAs |
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Journal Article |
| Year |
1974 |
Publication |
Sov. Phys. Semicond. |
Abbreviated Journal |
Sov. Phys. Semicond. |
| Volume |
7 |
Issue |
10 |
Pages |
1248-1250 |
| Keywords |
GaAs, excited donor states |
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Amer Inst Physics 1305 Walt Whitman Rd, Ste 300, Melville, Ny 11747-4501 Usa |
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no |
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1733 |
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Rasulova, G. K.; Pentin, I. V.; Goltsman, G. N. |
| Title |
Terahertz emission from a weakly-coupled GaAs/AlGaAs superlattice biased into three different modes of current self-oscillations |
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Journal Article |
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2019 |
Publication |
AIP Advances |
Abbreviated Journal |
AIP Advances |
| Volume |
9 |
Issue |
10 |
Pages |
105220 |
| Keywords |
GaAs/AlGaAs superlattice, SL, NbN HEB |
| Abstract |
Radio-frequency modulated terahertz (THz) emission power from weakly-coupled GaAs/AlGaAs superlattice (SL) has been increased by parallel connection of several SL mesas. Each SL mesa is a self-oscillator with its own oscillation frequency and mode. In coupled non-identical SL mesas biased at different voltages within the hysteresis loop the chaotic, quasiperiodic and frequency-locked modes of self-oscillations of current arise. THz emission was detected when three connected in parallel SL mesas were biased into the frequency-locked and quasiperiodic modes of self-oscillations of current, while in the chaotic mode of those it falls to the noise level. |
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2158-3226 |
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Approved |
no |
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Serial |
1274 |
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| Author |
Rasulova, G. K.; Brunkov, P. N.; Pentin, I. V.; Kovalyuk, V. V.; Gorshkov, K. N.; Kazakov, A. Y.; Ivanov, S. Y.; Egorov, A. Y.; Sakseev, D. A.; Konnikov, S. G. |
| Title |
Mutual synchronization of two coupled self-oscillators based on GaAs/AlGaAs superlattices |
Type |
Journal Article |
| Year |
2011 |
Publication |
Tech. Phys. |
Abbreviated Journal |
Tech. Phys. |
| Volume |
56 |
Issue |
6 |
Pages |
826-830 |
| Keywords |
GaAs/AlGaAs superlattices |
| Abstract |
The interaction of self-oscillators based on 30-period weakly coupled GaAs/AlGaAs superlattices is studied. The action of one self-oscillator on the other was observed for a constant bias voltage in the absence of generation of self-sustained oscillations in one of the oscillators. It is shown that induced oscillations in a forced oscillator appear due to excitation of oscillations in the system of coupled oscillators forming the electric-field domain wall at the frequency of one of the higher harmonics of a forcing oscillation. |
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Original Title |
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Series Title |
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Abbreviated Series Title |
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Edition |
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| ISSN |
1063-7842 |
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| Notes |
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Approved |
no |
| Call Number |
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Serial |
1214 |
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