Korneeva YP, Manova NN, Florya IN, Mikhailov MY, Dobrovolskiy OV, Korneev AA, et al. Different single-photon response of wide and narrow superconducting MoxSi1−x strips. Phys Rev Applied. 2020;13(2):024011 (1 to 7).
Abstract: The photon count rate (PCR) of superconducting single-photon detectors made of MoxSi1−x films shaped as a 2-μm-wide strip and a 115-nm-wide meander strip line is studied experimentally as a function of the dc biasing current at different values of the perpendicular magnetic field. For the wide strip, a crossover current Icross is observed, below which the PCR increases with an increasing magnetic field and above which it decreases. This behavior contrasts with the narrow MoxSi1−x meander, for which no crossover current is observed, thus suggesting different photon-detection mechanisms in the wide and narrow strips. Namely, we argue that in the wide strip the absorbed photon destroys superconductivity locally via the vortex-antivortex mechanism for the emergence of resistance, while in the narrow meander superconductivity is destroyed across the whole strip line, forming a hot belt. Accordingly, the different photon-detection mechanisms associated with vortices and the hot belt determine the qualitative difference in the dependence of the PCR on the magnetic field.
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Polyakova MI, Florya IN, Semenov AV, Korneev AA, Goltsman GN. Extracting hot-spot correlation length from SNSPD tomography data. In: J. Phys.: Conf. Ser. Vol 1410.; 2019. 012166 (1 to 4).
Abstract: We present data of quantum detector tomography for the samples specifically optimized for this problem. Using this method, we take results of hot-spot correlation length of 17 ± 2 nm.
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Goltsman GN, Korneev AA, Finkel MI, Divochiy AV, Florya IN, Korneeva YP, et al. Superconducting hot-electron bolometer as THz mixer, direct detector and IR single-photon counter [abstract]. In: 35th Int. Conf. Infrared, Millimeter, and Terahertz Waves.; 2010. p. 1.
Abstract: We present a new generation of superconducting single-photon detectors (SSPDs) and hot-electron superconducting sensors with record characteristic for many terahertz and optical applications.
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Korneeva Y P, Vodolazov D Y, Semenov AV, Florya IN, Simonov N, Baeva E, et al. Optical single photon detection in micron-scaled NbN bridges [Internet].; 2018 [cited 2024 Jul 16].arXiv:1802.02881v1 [cond-mat.supr-con]
Abstract: We demonstrate experimentally that single photon detection can be achieved in micron-wide NbN bridges, with widths ranging from 0.53 μm to 5.15 μm and for photon-wavelengths from 408 nm to 1550 nm. The microbridges are biased with a dc current close to the experimental critical current, which is estimated to be about 50 % of the theoretically expected depairing current. These results offer an alternative to the standard superconducting single-photon detectors (SSPDs), based on nanometer scale nanowires implemented in a long meandering structure. The results are consistent with improved theoretical modelling based on the theory of non-equilibrium superconductivity including the vortex-assisted mechanism of initial dissipation.
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Florya IN, Korneeva YP, Sidorova MV, Golikov AD, Gaiduchenko IA, Fedorov GE, et al. Energy relaxtation and hot spot formation in superconducting single photon detectors SSPDs. In: EPJ Web of Conferences. Vol 103.; 2015. 10004 (1 to 2).
Abstract: We have studied the mechanism of energy relaxation and resistive state formation after absorption of a single photon for different wavelengths and materials of single photon detectors. Our results are in good agreement with the hot spot model.
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