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Semenov, A. D.; Goghidze, I. G.; Gol’tsman, G. N.; Sergeev, A. V.; Gershenzon, E. M. |
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Title |
Evidence for the spectral dependence of nonequilibrium picosecond photoresponse of YBaCuO thin films |
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Journal Article |
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Year |
1993 |
Publication |
Appl. Phys. Lett. |
Abbreviated Journal |
Appl. Phys. Lett. |
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Volume |
63 |
Issue |
5 |
Pages  |
681-683 |
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Keywords |
YBCO HTS detectors, nonequilibrium |
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Abstract |
The transient voltage photoresponse of current biased YBaCuO thin films to 20 ps laser pulses of 0.63 and 1.54 μm wavelengths is measured for temperatures around the superconducting transition region. The fast picosecond decay of the response is followed by a slow nanosecond relaxation which is associated with the bolometric effect. The magnitude of the fast component of the response varies in proportion to the square root of wavelength that plausibly reflects multiplication processes of photoexcited electrons via electron–electron scattering and interaction with high energy phonons. |
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0003-6951 |
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1655 |
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Schubert, J.; Semenov, A.; Hübers, H.-W.; Gol'tsman, G.; Schwaab, G.; Voronov, B.; Gershenzon, E. |
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Title |
Broad-band terahertz NbN hot-electron bolometric mixer |
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Conference Article |
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Year |
1999 |
Publication |
Inst. Phys. Conf. |
Abbreviated Journal |
Inst. Phys. Conf. |
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Volume |
167 |
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663-666 |
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Keywords |
NbN HEB mixers |
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4th Europ. Conf. on Appl. Superconductivity, Barcelona, Spain, 14-17 September 1999 |
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1578 |
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Gol’tsman, G. N.; Gershenzon, E. M. |
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Title |
Phonon-cooled hot-electron bolometric mixer: overview of recent results |
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Journal Article |
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Year |
1999 |
Publication |
Appl. Supercond. |
Abbreviated Journal |
Appl. Supercond. |
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Volume |
6 |
Issue |
10-12 |
Pages |
649-655 |
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Keywords |
NbN HEB mixers |
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The paper presents an overview of recent results for NbN phonon-cooled hot electron bolometric (HEB) mixers. The noise temperature of the receivers based on both quasioptical and waveguide versions of HEB mixer has crossed the level of 1 K·GHz−1 at 430 GHz (410 K) and 600–650 GHz (480 K) and is close to this level at 820 GHz (1100 K) and 900 GHz (980 K). The gain bandwidth measured for quasioptical HEB mixer at 620 GHz reached 4 GHz and the noise temperature bandwidth was almost 8 GHz. Local oscillator power requirements are about 1 μW for mixers made by photolithography and are about 100 nW for mixers made by e-beam lithography. The studies in terahertz receivers based on HEB superconducting mixers now present a dynamic, rapidly developing field. |
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0964-1807 |
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1564 |
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Gershenzon, E. M.; Gol'tsman, G. N.; Potapov, V. D.; Sergeev, A. V. |
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Title |
Restriction of microwave enhancement of superconductivity in impure superconductors due to electron-electron interaction |
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1990 |
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Solid State Communications |
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Solid State Communications |
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75 |
Issue |
8 |
Pages |
639-641 |
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Keywords |
impure superconductors |
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Transition from microwave enhancement of supercurrent to superconductivity suppression is investigated in impure superconductors. It is demonstrated that the frequency range of the enhancement effect narrows with the decrease of the electron mean free path, l, and at l ⩽ 1 nm electron heating is observed in the whole frequency range. Dependences of frequency boundaries on l are explained by taking into account strong electron-electron interaction in impure metals. |
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0038-1098 |
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1687 |
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Gershenzon, E. M.; Goltsman, G. N.; Orlov, L. |
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Investigation of population and ionization of donor excited states in Ge |
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1976 |
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Physics of Semiconductors |
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Physics of Semiconductors |
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631-634 |
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Ge, donor excited states |
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Amsterdam |
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North-Holland Publishing Co. |
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1732 |
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