%0 Journal Article
%T Different single-photon response of wide and narrow superconducting Mo[sub:x]Si[sub:1−x] strips
%A Korneeva, Y. P.
%A Manova, N. N.
%A Florya, I. N.
%A Mikhailov, M. Y.
%A Dobrovolskiy, O. V.
%A Korneev, A. A.
%A Vodolazov, D. Y.
%J Phys. Rev. Applied
%D 2020
%V 13
%N 2
%@ 2331-7019
%F Korneeva_etal2020
%O exported from refbase (https://db.rplab.ru/refbase/show.php?record=1790), last updated on Tue, 01 Jun 2021 21:23:33 -0500
%X 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.
%K MoSi SSPD
%K SNSPD
%R 10.1103/PhysRevApplied.13.024011
%U https://link.aps.org/doi/10.1103/PhysRevApplied.13.024011
%U https://doi.org/10.1103/PhysRevApplied.13.024011
%P 024011 (1 to 7)