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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Korneeva YP, Mikhailov MY, Pershin YP, Manova NN, Divochiy AV, Vakhtomin YB, et al. Superconducting single-photon detector made of MoSi film. Supercond Sci Technol. 2014;27(9):095012.
Abstract: We fabricated and characterized nanowire superconducting single-photon detectors made of 4 nm thick amorphous Mox Si1−x films. At 1.7 K the best devices exhibit a detection efficiency (DE) up to 18% at 1.2 $\mu {\rm m}$ wavelength of unpolarized light, a characteristic response time of about 6 ns and timing jitter of 120 ps. The DE was studied in wavelength range from 650 nm to 2500 nm. At wavelengths below 1200 nm these detectors reach their maximum DE limited by photon absorption in the thin MoSi film.
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Vodolazov DY, Manova NN, Korneeva YP, Korneev AA. Timing jitter in NbN superconducting microstrip single-photon detector. Phys Rev Applied. 2020;14(4):044041 (1 to 8).
Abstract: We experimentally study timing jitter of single-photon detection by NbN superconducting strips with width w ranging from 190 nm to 3μm. We find that timing jitter of both narrow (190 nm) and micron-wide strips is about 40 ps at currents where internal detection efficiency η saturates and it is close to our instrumental jitter. We also calculate intrinsic timing jitter in wide strips using the modified time-dependent Ginzburg-Landau equation coupled with a two-temperature model. We find that with increasing width the intrinsic timing jitter increases and the effect is most considerable at currents where a rapid growth of η changes to saturation. We relate it with complicated vortex and antivortex dynamics, which depends on a photon’s absorption site across the strip and its width. The model also predicts that at current close to depairing current the intrinsic timing jitter of a wide strip could be about ℏ/kBTc (Tc is a critical temperature of superconductor), i.e., the same as for a narrow strip.
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Simonov NO, Korneeva YP, Korneev AA, Goltsman GN. Enhance of the superconducting properties of the NbN/Au bilayer bridges. In: J. Phys.: Conf. Ser. Vol 1695.; 2020. 012132 (1 to 4).
Abstract: We experimentally demonstrate strong temperature dependence of the critical current of the superconducting 600-nm-wide and 5-μm-long bridge made of NbN/Au bilayer. The result is achieved due to the proximity effect realized between the highly disordered superconducting NbN layer and low resistive normal-metal Au layer.
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Sidorova MV, Kozorezov AG, Semenov AV, Korneeva YP, Mikhailov MY, Devizenko AY, et al. Nonbolometric bottleneck in electron-phonon relaxation in ultrathin WSi films. Phys Rev B. 2018;97(18):184512 (1 to 13).
Abstract: We developed the model of the internal phonon bottleneck to describe the energy exchange between the acoustically soft ultrathin metal film and acoustically rigid substrate. Discriminating phonons in the film into two groups, escaping and nonescaping, we show that electrons and nonescaping phonons may form a unified subsystem, which is cooled down only due to interactions with escaping phonons, either due to direct phonon conversion or indirect sequential interaction with an electronic system. Using an amplitude-modulated absorption of the sub-THz radiation technique, we studied electron-phonon relaxation in ultrathin disordered films of tungsten silicide. We found an experimental proof of the internal phonon bottleneck. The experiment and simulation based on the proposed model agree well, resulting in τe−ph∼140–190 ps at TC=3.4K, supporting the results of earlier measurements by independent techniques.
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