| Records |
| Author |
Verevkin, A.; Gershenzon, E. M.; Gol'tsman, G. N.; Ptitsina, N. G.; Chulkova, G. M.; Smirnov, K. S.; Sobolewski, R. |
| Title |
Direct measurements of energy relaxation times in two-dimensional structures under quasi-equilibrium conditions |
Type |
Conference Article |
| Year |
2002 |
Publication |
Mater. Sci. Forum |
Abbreviated Journal |
Mater. Sci. Forum |
| Volume |
384-3 |
Issue |
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Pages |
107-116 |
| Keywords |
2DEG, AlGaAs/GaAs |
| Abstract |
A new microwave technique was successfully applied for direct studies of energy relaxation times in two-dimensional AlGaAs/GaAs structures under quasi-equilibrium conditions in the nanosecond and picosecond time scale. We report our results of energy relaxation time measurements in the temperature range 1.6-50 K, in quantum Hall effect regime in magnetic fields up to 4 T. |
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Materials Science Forum |
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1536 |
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Verevkin, A.; Xu, Y.; Zheng, X.; Williams, C.; Sobolewski, Roman; Okunev, O.; Smirnov, K.; Chulkova, G.; Korneev, A.; Lipatov, A.; Gol’tsman, G. N. |
| Title |
Superconducting NbN-based ultrafast hot-electron single-photon detector for infrared range |
Type |
Conference Article |
| Year |
2001 |
Publication |
Proc. 12th Int. Symp. Space Terahertz Technol. |
Abbreviated Journal |
Proc. 12th Int. Symp. Space Terahertz Technol. |
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Pages |
462-468 |
| Keywords |
NbN SSPD, SNSPD |
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1539 |
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Gol'tsman, Gregory; Semenov, Alexei; Smirnov, Konstantin; Voronov, Boris |
| Title |
Background limited quantum superconducting detector for submillimeter wavelengths |
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Conference Article |
| Year |
2001 |
Publication |
Proc. 12th Int. Symp. Space Terahertz Technol. |
Abbreviated Journal |
Proc. 12th Int. Symp. Space Terahertz Technol. |
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469-475 |
| Keywords |
Ti SQD, SQUID readout |
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1540 |
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Gol’tsman, G. N.; Smirnov, K. V. |
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Electron-phonon interaction in a two-dimensional electron gas of semiconductor heterostructures at low temperatures |
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Journal Article |
| Year |
2001 |
Publication |
Jetp Lett. |
Abbreviated Journal |
Jetp Lett. |
| Volume |
74 |
Issue |
9 |
Pages |
474-479 |
| Keywords |
2DEG, AlGaAs/GaAs heterostructures |
| Abstract |
Theoretical and experimental works devoted to studying electron-phonon interaction in the two-dimensional electron gas of semiconductor heterostructures at low temperatures in the case of strong heating in an electric field under quasi-equilibrium conditions and in a quantizing magnetic field perpendicular to the 2D layer are considered. |
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0021-3640 |
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По итогам проектов российского фонда фундаментальных исследований. Проект РФФИ # 98-02-16897 Электрон-фононное взаимодействие в двумерном электронном газе полупроводниковых гетероструктур при низких температурах |
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1541 |
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| Author |
Gol’tsman, G. N.; Okunev, O.; Chulkova, G.; Lipatov, A.; Semenov, A.; Smirnov, K.; Voronov, B.; Dzardanov, A.; Williams, C.; Sobolewski, R. |
| Title |
Picosecond superconducting single-photon optical detector |
Type |
Journal Article |
| Year |
2001 |
Publication |
Appl. Phys. Lett. |
Abbreviated Journal |
Appl. Phys. Lett. |
| Volume |
79 |
Issue |
6 |
Pages |
705-707 |
| Keywords |
NbN SSPD, SNSPD |
| Abstract |
We experimentally demonstrate a supercurrent-assisted, hotspot-formation mechanism for ultrafast detection and counting of visible and infrared photons. A photon-induced hotspot leads to a temporary formation of a resistive barrier across the superconducting sensor strip and results in an easily measurable voltage pulse. Subsequent hotspot healing in ∼30 ps time frame, restores the superconductivity (zero-voltage state), and the detector is ready to register another photon. Our device consists of an ultrathin, very narrow NbN strip, maintained at 4.2 K and current-biased close to the critical current. It exhibits an experimentally measured quantum efficiency of ∼20% for 0.81 μm wavelength photons and negligible dark counts. |
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0003-6951 |
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1543 |
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