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Селиверстов, С. В.; Финкель, М. И.; Рябчун, С. А.; Воронов, Б. М.; Каурова, Н. С.; Селезнев, В. А.; Смирнов, К. В.; Вахтомин, Ю. Б.; Пентин, И. В.; Гольцман, Г. Н. |
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Терагерцевый сверхпроводниковый детектор с аттоджоулевым энергетическим разрешением и постоянной времени 25 пс |
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Conference Article |
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2014 |
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Труды XVIII международного симпозиума «Нанофизика и наноэлектроника» |
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1 |
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91-92 |
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NbN HEB |
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Представлены результаты измерения энергетического разрешения терагерцевого сверхпроводникового NbN-детектора на эффектеэлектронного разогрева, работающего при температуре около 10 К. Использование инновационной in situ технологии производства привело к существенному улучшению чувствительности детектора. Увеличение быстродействия детектора было достигнуто за счет реализации дополнительного диффузионного канала охла-ждения электронной подсистемы. Измеренное значение эквивалентной мощности шума на частоте 2.5 ТГц составило 2.0×10-13Вт•Гц-0.5, постоянной времени 25 пс. Соответствующее расчетное значение энергетического разрешения составило 2.5 аДж. |
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Нижний Новгород, Россия |
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1833 |
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Бурмистрова, А. В.; Девятов, И. А. |
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Расчет электронного транспорта в гетероструктурах, содержащих многозонные сверхпроводники |
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Conference Article |
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2014 |
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Труды XVIII международного симпозиума «Нанофизика и наноэлектроника» |
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1 |
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21-22 |
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N/I/Sp junctions |
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В рамках приближения сильной связи теоретически рассчитаны проводимости контактов вида нормальный металл/изолятор/одноорбитальный сверхпроводник с p-типом сверхпроводящего спаривания (N/I/Sp). Объяснено наблюдаемое экспериментально как появление пика при нулевом напряжении, так и его расщепление в зависимости от толщины слоя изолятора. В рамках этой же микроскопической теории развит вариант техники решеточной функции Грина в мацубаровом представлении. Используя разработанный подход, рассчитаны фазовые и температурные зависимости тока Джозефсона для контакта сверхпроводника s-типа и многозонного железосодержащего сверхпроводника (ферропниктида) для различных ориентаций границы по отношению к кристаллографическим осям пниктида. |
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Нижний Новгород, Россия |
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1834 |
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Кардакова, А. И.; Финкель, М. И.; Морозов, Д. В.; Ковалюк, В. В.; Ан, П. П.; Гольцман, Г. Н. |
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Время электрон-фононного взаимодействия в сверхпроводниковых пленках нитрида титана |
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Conference Article |
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2014 |
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Труды XVIII международного симпозиума «Нанофизика и наноэлектроника» |
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1 |
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47-48 |
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TiN films |
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Определены времена электрон-фононного взаимодействия в тонких сверхпроводниковых пленках нитрида титана. Измеренные значения τ_eph находятся в диапазоне от 5.5 нс до 88 нс при температурах 4,2 К и 1,7 К, соответственно, и соответствуют температурной зависимости Т^-3. |
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Нижний Новгород, Россия |
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1835 |
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Корнеева, Ю. П.; Михайлов, М. М.; Манова, Н. Н.; Дивочий, А. А.; Корнеев, А. А.; Вахтомин, Ю. Б.; Першин, Ю. П.; Гольцман, Г. Н. |
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Сверхпроводниковый однофотонный детектор на основе аморфных пленок MoSi |
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2014 |
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Труды XVIII международного симпозиума «Нанофизика и наноэлектроника» |
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1 |
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53-54 |
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MoSi SSPD |
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Нами были изготовлены и исследованы однофотонные детекторы на основе сверхпроводящих пленок Mo x Si 1-x двух различных стехиометрий: Mo 3 Si и Mo 4 Si. При температуре 1.7 К лучшие детекторы площадью 7 мкм*7 мкм на основе этих пленок продемонстрировали системную квантовую эффективность 18% при скорости темнового счета 10 с -1 на длине волны 1.2 мкм с использованием неполяризованного источника, длительность импульса – 6 нс, джиттер – 120 пс. |
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Нижний Новгород, Россия |
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1836 |
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Irimajiri, Y.; Kumagai, M.; Morohashi, I.; Kawakami, A.; Nagano, S.; Sekine, N.; Ochiai, S.; Tanaka, S.; Hanado, Y.; Uzawa, Y.; Hosako, I. |
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Phase-locking of a THz-QCL using a Low Noise HEB mixer, and a Frequency-comb as a Reference |
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2014 |
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39th Int. Conf. IRMMW-THz |
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39th Int. Conf. IRMMW-THz |
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1-2 |
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We have developed a phase-locking system of a 3.1THz QCL (Quantum Cascade Laser) using a low noise hot electron bolometer mixer (HEBM) and a THz reference. The THz reference was generated by photomixing two optical modes of a frequency comb. The THz-QCL and HEBM devices are fabricated in our laboratory. A line width of the phase-locked QCL of narrower than 1Hz was achieved. |
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978-1-4799-3877-3 |
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RPLAB @ atomics90 @ |
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969 |
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Averkin, A. S.; Shishkin, A. G.; Chichkov, V. I.; Voronov, B. M.; Goltsman, G. N.; Karpov, A.; Ustinov, A. V. |
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Tunable frequency-selective surface based on superconducting split-ring resonators |
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2014 |
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8th Metamaterials |
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8th Metamaterials |
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superconducting split-ring resonators |
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We study a possibility to use the 2D superconducting metamaterial as a tunable frequency-selective surface (FSS). The proposed FSS is made of sub-wavelength size (l/14) metamaterial unit cells, where a split-ring resonator is embedded in a small iris aperture in a metal plane. The split-ring resonator is made of NbN film, and its resonance frequency is tuned by the temperature of the sample, changing the kinetic inductance of NbN film. The Ansoft HFSS simulation predicts the FSS tuning range of about 10-20 %. The developed superconducting FSS may be used as a tunable band-pass filter or modulator. |
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Copenhagen, Denmark |
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8th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics – Metamaterials |
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1749 |
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Miao, W.; Zhang, W.; Zhong, J. Q.; Shi, S. C.; Delorme, Y.; Lefevre, R.; Feret, A; Vacelet, T |
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Non-uniform absorption of terahertz radiation on superconducting hot electron bolometer microbridges |
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2014 |
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Appl. Phys. Lett. |
Abbreviated Journal |
<ef><bf><bc>Appl. Phys. Lett. |
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104 |
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052605(1-4) |
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NbN HEB mixers, local oscillator power, RF nonuniform absorption |
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We interpret the experimental observation of a frequency-dependence of superconducting hot electron bolometer (HEB) mixers by taking into account the non-uniform absorption of the terahertz radiation on the superconducting HEB microbridge. The radiation absorption is assumed to be proportional to the local surface resistance of the HEB microbridge, which is computed using the Mattis-Bardeen theory. With this assumption the dc and mixing characteristics of a superconducting niobium-nitride (NbN) HEB device have been modeled at frequencies below and above the equilibrium gap frequency of the NbN film. |
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Bennett, Douglas A.; Schmidt, Daniel R.; Swetz, Daniel S.; Ullom, Joel N. |
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Phase-slip lines as a resistance mechanism in transition-edge sensors |
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2014 |
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Appl. Phys. Lett. |
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Appl. Phys. Lett. |
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104 |
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042602 |
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microbolometers, TES, phase-slip lines, PSL |
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The fundamental mechanism of resistance in voltage-biased superconducting films is poorly understood despite its importance as the basis of transition-edge sensors (TESs). TESs are utilized in state-of-the-art microbolometers and microcalorimeters covering a wide range of energies and applications. We present a model for the resistance of a TES based on phase-slip lines (PSLs) and compare the model to data. One of the model's predictions, discrete changes in the number of PSLs, is a possible explanation for the observed switching between discrete current states in localized regions of bias. |
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Recommended by Klapwijk |
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929 |
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Maslennikov, S. |
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RF heating efficiency of the terahertz superconducting hot-electron bolometer |
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2014 |
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arXiv |
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arXiv |
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1404.5276 |
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1-4 |
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superconducting hot-electron bolometer mixer, HEB, NbN, distributed model, HEB model, HEB mixer model, heat balance equa-tions, conversion gain, RF heating efficiency, noise temperature, simulation, Euler method |
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We report results of the numerical solution by the Euler method of the system of heat balance equations written in recurrent form for the superconducting hot-electron bolometer (HEB) embedded in an electrical circuit. By taking into account the dependence of the HEB resistance on the transport current we have been able to calculate rigorously the RF heating efficiency, absorbed local oscillator (LO) power and conversion gain of the HEB mixer. We show that the calculated conversion gai nis in excellent agreement with the experimental results, and that the substitution of the calculated RF heating efficiency and absorbed LO power into the expressions for the conversion gain and noise temperature given by the analytical small-signal model of the HEB yields excellent agreement with the corresponding measured values |
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RPLAB @ atomics90 @ |
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954 |
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Lusche, R.; Semenov, A.; Ilin, K.; Siegel, M.; Korneeva, Y.; Trifonov, A.; Korneev, A.; Goltsman, G.; Vodolazov, D.; Hübers, H.-W. |
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Effect of the wire width on the intrinsic detection efficiency of superconducting-nanowire single-photon detectors |
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2014 |
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J. Appl. Phys. |
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J. Appl. Phys. |
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116 |
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4 |
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043906 (1 to 9) |
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NbN SSPD, SNSPD, TaN |
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A thorough spectral study of the intrinsic single-photon detection efficiency in superconducting TaN and NbN nanowires with different widths has been performed. The experiment shows that the cut-off of the intrinsic detection efficiency at near-infrared wavelengths is most likely controlled by the local suppression of the barrier for vortex nucleation around the absorption site. Beyond the cut-off quasi-particle diffusion in combination with spontaneous, thermally activated vortex crossing explains the detection process. For both materials, the reciprocal cut-off wavelength scales linearly with the wire width where the scaling factor agrees with the hot-spot detection model. |
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