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Rise time of voltage pulses in NbN superconducting single photon detectors
Applied Physics Letters. 2016. Vol. 109. P. 052601-1 -052601-5.
Smirnov K., Divochiy A. V., Vakhtomin Y. B., Sidorova M. V., Karpova U. V., Morozov P. V., Seleznev V. A., Zotova A. N., Vodolazov D. Y.
We have found experimentally that the rise time of voltage pulse in NbN superconducting single photon detectors increases nonlinearly with increasing the length of the detector L. The effect is connected with dependence of resistance of the detector Rn, which appears after photon absorption, on its kinetic inductance Lk and, hence, on the length of the detector. This conclusion is confirmed by our calculations in the framework of two temperature model.
Smirnov K., Divochiy A., Vakhtomin Y. et al., Superconductor Science and Technology 2018 Vol. 31 No. 3 P. 1-7
The possibility of creating NbN superconducting single-photon detectors with saturated dependence of quantum efficiency (QE) versus normalized bias current was investigated. It was shown that the saturation increases for the detectors based on finer films with a lower value of R s300/R s20. The decreasing of R s300/R s20 was related to the increasing influence ...
Added: March 14, 2018
Vorobyov V. V., Kazakov A. Y., Soshenko V. V. et al., Optical Materials Express 2017 Vol. 7 No. 2 P. 513-526
Further development of quantum emitter based communication and sensing applications intrinsically depends on the availability of robust single-photon detectors. Here, we demonstrate a new generation of superconducting single-photon detectors specifically optimized for the 500-1100 nm wavelength range, which overlaps with the emission spectrum of many interesting solid-state atom-like systems, such as nitrogen-vacancy and silicon-vacancy centers ...
Added: February 22, 2017
Kahl O., Ferrari S., Kovalyuk V. et al., Scientific Reports 2015 Vol. 5 P. 10941
Superconducting nanowire single-photon detectors (SNSPDs) provide high efficiency for detecting individual photons while keeping dark counts and timing jitter minimal. Besides superior detection performance over a broad optical bandwidth, compatibility with an integrated optical platform is a crucial requirement for applications in emerging quantum photonic technologies. Here we present SNSPDs embedded in nanophotonic integrated circuits ...
Added: September 3, 2015
Shcheslavskiy V., Morozov P., Divochiy A. et al., Review of Scientific Instruments 2016 Vol. 87 No. 5 P. 053117-1-053117-5
Time resolution is one of the main characteristics of the single photon detectors besides quantum efficiency and dark count rate. We demonstrate here an ultrafast time-correlated single photon counting (TCSPC)setup consisting of a newly developed single photon counting board SPC-150NX and a superconducting NbN single photon detector with a sensitive area of 7 × 7 μm. The combination delivers a record instrument response function ...
Added: July 6, 2016
Kagan M. Yu., Val’kov V. V., Mitskan V. A. et al., Solid State Communications 2014 Vol. 188 P. 61-66
Idealized graphene monolayer is considered neglecting the van der Waals potential of the substrate and the role of the nonmagnetic impurities. The effect of the long-range Coulomb repulsion in an ensemble of Dirac fermions on the formation of the superconducting pairing in a monolayer is studied in the framework of the Kohn–Luttinger mechanism. The electronic ...
Added: April 1, 2015
Хохлов Д. А., Akzyanov R. S., Physica E: Low-Dimensional Systems and Nanostructures 2021 No. 133 Article 114800
We theoretically investigate quasiparticle interference in superconducting topological insulators with the nematic order parameter. This order parameter spontaneously breaks the rotational symmetry of the crystal. Such violation of rotational symmetry is seen in both coordinate and momentum spaces of the quasiparticles interference patterns. For small bias voltages quasiparticle interference incommensurate with the crystal symmetry and ...
Added: February 4, 2022
Shcherbatenko M., Lobanov Y., Semenov A. V. et al., Optics Express 2016 Vol. 24 No. 26 P. 30474-30484
Here, we report on the successful operation of a NbN thin film superconducting nanowire single-photon detector (SNSPD) in a coherent mode (as a mixer) at the telecommunication wavelength of 1550 nm. Providing the local oscillator power of the order of a few picowatts, we were practically able to reach the quantum noise limited sensitivity. The ...
Added: February 2, 2017
Deminov R. G., Tagirov L. R., Gaifullin R. R. et al., Journal of Magnetism and Magnetic Materials 2015 Vol. 373 P. 16-17
We investigate the critical temperature Tc of F2/F1/S trilayers (Fi is a ferromagnetic metal and S is a singlet superconductor), where the long-range triplet superconducting component is generated at noncollinear magnetizations of the F layers. In this paper we demonstrate a possibility of the spin-valve effect mode selection (standard switching effect, the triplet spin-valve effect ...
Added: October 14, 2016
Burovskiy E., Потапова А. С., Springer, 2022
We study the dimensional crossover of polarized superfluids. Employing large-scale numerical simulations the attractive Hubbard on multi-leg ladders with up to five legs, we construct ground-state phase diagrams which feature polarized (Fulde-Ferrell-Larkin-Ovchinnikov like) and unpolarized (Bardeen-Cooper-Schrieffer like) phases and trace the crossover from strictly one-dimensional behavior to higher dimensions. We pay special attention to the ...
Added: December 16, 2022
Smirnov K., Vachtomin Y., Divochiy A. et al., Applied Physics Express 2015 Vol. 8 No. 2 P. 022501-1-022501-4
We found that background radiation limits the dark count rates of superconducting single photon detectors coupled to standard single mode optical fibers to a minimum level when the source temperature of the photons is close to 300 K. We measured this level to be 103 cps, which was confirmed by a theoretical analysis of the ...
Added: October 15, 2015
P. A. Ioselevich, M. V. Feigelman, New Journal of Physics 2013 No. 15 P. 055011
We study tunneling spectroscopy of subgap Andreev states in a superconducting system and discuss the general situation when the discrete nature of these levels is relevant and thus the standard semiclassical result for tunneling conductance being proportional to the density of states is not applicable. If the tunneling coupling is weak, individual levels are resolved ...
Added: October 19, 2016
Lobanov Y., Shcherbatenko M. L., Shurakov A. et al., Optics Letters 2014 Vol. 39 No. 6 P. 1429-1432
We report on the development of a highly sensitive optical receiver for heterodyne IR spectroscopy at the communication wavelength of 1.5 μm (200 THz) by use of a superconducting hot-electron bolometer. The results are important for the resolution of narrow spectral molecular lines in the near-IR range for the study of astronomical objects, as well ...
Added: February 24, 2016
Gayduchenko I., Kardakova A., Fedorov G. E. et al., Journal of Applied Physics 2015 Vol. 118 No. 19 P. 194303-1-194303-9
Demand for efficient terahertz radiation detectors resulted in intensive study of the asymmetric carbon nanostructures as a possible solution for that problem. It was maintained that photothermoelectric effect under certain conditions results in strong response of such devices to terahertz radiation even at room temperature. In this work, we investigate different mechanisms underlying the response ...
Added: February 19, 2016
Arutyunov K., Sedov E., Golokolenov I. et al., Physics of the Solid State, Springer Nature Switzerland AG 2019 Vol. 61 No. 9 P. 1559-1562
High-quality aluminum films on GaAs substrates are studied experimentally. The critical temperature of superconductivity is found to increase markedly with decreasing the film thickness. The observed phenomenon is considered as a manifestation of the quantum confinement effect, which affects both the density of states and the electron–phonon interaction. ...
Added: September 14, 2019
Vagov A., Tiago T. Saraiva, Arkady A. Shanenko et al., Communications Physics 2023 Vol. 6 Article 284
In many pnictides the superconductivity coexists with ferromagnetism in an accessible range of temperatures and compositions. Recent experiments revealed that when the temperature of magnetic ordering Tm is below the superconducting transition temperature Tc, highly non-trivial physical phenomena occur. In this work we demonstrate the existence of a temperature window, situated between Tm and Tc, where these intrinsically type-II superconductors are ...
Added: October 18, 2023
Andrew G. Semenov, Zaikin A., Physical Review B: Condensed Matter and Materials Physics 2013 Vol. 88 No. 5 P. 054505-1-054505-10
We investigate the effect of interacting quantum phase slips on persistent current and its fluctuations in ultrathin superconducting nanowires and nanorings pierced by the external magnetic flux. We derive the effective action for these systems and map the original problem onto an effective sine-Gordon theory on torus. We evaluate both the flux dependent persistent current ...
Added: February 9, 2015
Bosboom V., Van der Vegt J. J., Kupriyanov M. Y. et al., Superconductor Science and Technology 2022 Vol. 34 No. 11 Article 115022
We develop a quantitative model describing the distribution of the supercurrent density and
density of states in SN-N-NS type Josephson junctions in three dimensions (S is a
superconductor and N is a normal metal). The model is based on the self-consistent solution of
the quasiclassical Usadel equations using the finite element method. We investigate the
influence of the proximity ...
Added: October 31, 2022
T. Karabassov, A.A. Golubov, Silkin V. M. et al., Physical Review B: Condensed Matter and Materials Physics 2021 Vol. 103 P. 224508-1-224508-9
Superconducting hybrid structures with topological order and induced magnetization offer a promising way to realize fault-tolerant quantum computation. However, the effect of the interplay between magnetization and the property of the topological insulator surface, otherwise known as spin-momentum locking on the superconducting proximity effect, still remains to be investigated. We relied on the quasiclassical self-consistent ...
Added: June 4, 2021
Камашев А. А., Гарифьянов Н. Н., Валидов А. А. et al., Физика твердого тела 2022 Т. 64 № 9 С. 1201-1210
Проведен анализ транспортных свойств двух типов спиновых клапанов, в которых в качестве одного из двух ферромагнитных слоев в структурах Ф1/Ф2/C использовался сплав Гейслера Co_{2}Cr_{1−x}Fe_{x}Al_{y}. Слой сплава Гейслера был использован: 1) в качестве слабого ферромагнетика, в случае Ф2-слоя; 2) в качестве полуметалла, в случае Ф1-слоя. В первом случае, был получен большой классический эффект сверхпроводящего спинового клапана ...
Added: October 31, 2022
Shurakov A., Lobanov Y., Goltsman G., Superconductor Science and Technology 2015 Vol. 29 No. 2 P. 023001
The discovery of hot-electron phenomena in a thin superconducting film in the last century was followed by numerous experimental studies of its appearance in different materials aiming for a better understanding of the phenomena and consequent implementation of terahertz detection systems for practical applications. In contrast to the competitors such as superconductor-insulator-superconductor tunnel junctions and ...
Added: February 19, 2016
Bakurskiy S. V., Fominov Ya.V., Shevchun A. F. et al., Physical Review B: Condensed Matter and Materials Physics 2018 Vol. 98 P. 134508-1-134508-16
We develop a self-consistent approach for calculating the local impedance at a rough surface of a chiral p-wave superconductor. Using the quasiclassical Eilenberger-Larkin-Ovchinnikov formalism, we numerically find the pair potential, pairing functions, and the surface density of states taking into account diffusive electronic scattering at the surface. The obtained solutions are then employed for studying ...
Added: October 31, 2018
Duarte E. C., Sardella E., Teixeira Saraiva T. et al., / Cornell University. Series cond-mat "arxiv.org". 2022. No. 2209.
The presence of magnetic fields and/or transport currents can cause penetration of vortices in superconductors. Their motion leads to dissipation and resistive state arises, which in turn strongly affects the performance of superconducting devices such as single-photon and single-electron detectors. Therefore, an understanding of the dissipation mechanisms in mesoscopic superconductors is not only of fundamental ...
Added: November 7, 2022
T. Karabassov, A.V. Guravova, A.Yu. Kuzin et al., Beilstein Journal of Nanotechnology 2020 Vol. 11 P. 252-262
We present a quantitative study of the current–voltage characteristics (CVC) of SFIFS Josephson junctions (S = bulk superconductor, F = metallic ferromagnet, I = insulating barrier) with weak ferromagnetic interlayers in the diffusive limit. The problem is solved in the framework of the nonlinear Usadel equations. We consider the case of a strong tunnel barrier ...
Added: February 13, 2020
Kuzovnikov M., Antonov Vladimir E., Kulakov V. et al., PHYSICAL REVIEW MATERIALS 2023 Vol. 7 No. 2 Article 024803
Zirconium trihydride and, for comparison, trideuteride with hexagonal close-packed (hcp) metal lattices
were synthesized at a hydrogen/deuterium pressure of 9 GPa and a temperature of 873 K using toroid-type
high-pressure chambers. After a rapid cooling (quenching) to 100 K and lowering the pressure to atmospheric,
the quenched sample was removed from the chamber and studied by hot extraction ...
Added: February 13, 2024