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Sidorova, M.; Semenov, A.; Hübers, H.-W.; Kuzmin, A.; Doerner, S.; Ilin, K.; Siegel, M.; Charaev, I.; Vodolazov, D. |
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Timing jitter in photon detection by straight superconducting nanowires: Effect of magnetic field and photon flux |
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Journal Article |
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2018 |
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Phys. Rev. B |
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Phys. Rev. B |
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98 |
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13 |
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134504 (1 to 14) |
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SNSPD, NbN namowires |
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We studied the effects of the external magnetic field and photon flux on timing jitter in photon detection by straight superconducting NbN nanowires. At two wavelengths 800 and 1560 nm, statistical distribution in the appearance times of photon counts exhibits Gaussian shape at small times and an exponential tail at large times. The characteristic exponential time is larger for photons with smaller energy and increases with external magnetic field while variations in the Gaussian part of the distribution are less pronounced. Increasing photon flux drives the nanowire from the discrete quantum detection regime to the uniform bolometric regime that averages out fluctuations of the total number of nonequilibrium electrons created by the photon and drastically reduces jitter. The difference between standard deviations of Gaussian parts of distributions for these two regimes provides the measure for the strength of electron-number fluctuations; it increases with the photon energy. We show that the two-dimensional hot-spot detection model explains qualitatively the effect of magnetic field. |
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2469-9950 |
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1842 |
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Hübers, H.-W.; Semenov, A.; Richter, H.; Birk, Manfred; Krocka, Michael; Mair, Ulrich; Smirnov, K.; Gol'tsman, G.; Voronov, B. |
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Title |
Terahertz heterodyne receiver with a hot-electron bolometer mixer |
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Conference Article |
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2002 |
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Proc. Far-IR, Sub-mm, and mm Detector Technology Workshop |
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Proc. Far-IR, Sub-mm, and mm Detector Technology Workshop |
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NbN HEB mixers |
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During the past decade major advances have been made regarding low noise mixers for terahertz (THz) heterodyne receivers. State of the art hot-electron-bolometer (HEB) mixers have noise temperatures close to the quantum limit and require less than a µW power from the local oscillator (LO). The technology is now at a point where the performance of a practical receiver employing such mixer, rather than the figures of merit of the mixer itself, are of major concern. We have incorporated a phonon-cooled NbN HEB mixer in a 2.5 THz heterodyne receiver and investigated the performance of the receiver. This yields important information for the development of heterodyne receivers such as GREAT (German receiver for astronomy at THz frequencies aboard SOFIA)[1] and TELIS (Terahertz limb sounder), a balloon borne heterodyne receiver for atmospheric research [2]. Both are currently under development at DLR. |
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Monterey, CA, USA |
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Wold, J.; Davidson, J. |
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4 pages; Unconfirmed but cited in https://kups.ub.uni-koeln.de/1622/1/bedorf.pdf; There is a Program of the Workshop: https://www.yumpu.com/en/document/view/7411055/far-ir-submm-mm-detector-technology-workshop-sofia-usra (there is no title of this article in the Program); There is also identical publication in Proc. ISSTT (Serial: 332, “A broadband terahertz heterodyne receiver with an NbN HEB mixer”). |
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1829 |
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Гершензон, Е. М.; Литвак-Горская, Л. Б.; Рабинович, Р. И. |
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Отрицательное магнитосопротивление в случае проводимости по верхней зоне Хаббарда |
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1983 |
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Физика и техника полупроводников |
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Физика и техника полупроводников |
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17 |
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10 |
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1873-1876 |
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compensated n-InSb, Hubbard upper zone conductivity, negative magnetoresistance |
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1763 |
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Гершензон, Е. М.; Литвак-Горская, Л. Б.; Луговая, Г. Я.; Шапиро, Е. З. |
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Об интерпретации отрицательного магнитосопротивления в случае проводимости по верхней зоне Хаббарда в n-Ge⟨Sb⟩ |
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1986 |
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Физика и техника полупроводников |
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Физика и техника полупроводников |
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20 |
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1 |
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99-103 |
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n-Ge, Hubbard upper zone conductivity, negative magnetoresistance |
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В рамках теории квантовых поправок к проводимости объяснено отрицательное магнитосопротивление в n-Ge с концентрацией доноров Nd≃2.8⋅1016÷1.1⋅1017см−3, наблюдаемое в диапазоне температур 4.2−10 K, когда основной вклад в проводимость дают электроны верхней зоны Хаббарда. Показано, что время релаксации фазы волновой функции τφ определяется временем электрон-фононного взаимодействия τeph. |
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1759 |
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Гальперин, Ю. М.; Гершензон, Е. М.; Дричко, И. Л.; Литвак-Горская, Л. Б. |
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Кинетические явления в компенсированном n-InSb при низких температурах |
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1990 |
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Физика и техника полупроводников |
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Физика и техника полупроводников |
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24 |
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1 |
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3-24 |
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compensated n-InSb, impurities |
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Представлен обзор результатов цикла исследований природы электропроводности предельно очищенных образцов антимонида индия n-типа. Рассмотрены способы определения концентрации доноров и степени компенсации в этом материале, обсуждается роль свободных и локализованных на донорах электронов в электропроводности при гелиевых температурах. Обсуждение основано на анализе результатов исследования гальваномагнитных явлений, поглощения СВЧ излучения миллиметрового и субмиллиметрового диапазонов и ультразвука. Рассмотрены способы определения характеристик материала на основе комплекса результатов, полученных с помощью указанных методов. Обсуждается также фотопроводимость по примесям в n-InSb. |
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Russian |
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