Different Single-Photon Response of Wide and Narrow Superconducting MoxSi1x Strips

Yu. P. Korneeva, N.N. Manova, I.N. Florya, M. Yu. Mikhailov, O.V. Dobrovolskiy, A.A. Korneev, and D. Yu. Vodolazov
Phys. Rev. Applied 13, 024011 – Published 6 February 2020

Abstract

The photon count rate (PCR) of superconducting single-photon detectors made of MoxSi1x 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 MoxSi1x 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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  • Received 3 October 2019
  • Revised 28 November 2019
  • Accepted 29 December 2019

DOI:https://doi.org/10.1103/PhysRevApplied.13.024011

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Yu. P. Korneeva1,*, N.N. Manova1, I.N. Florya1, M. Yu. Mikhailov2, O.V. Dobrovolskiy3,4, A.A. Korneev1,5, and D. Yu. Vodolazov1,6

  • 1Physics Department, Moscow Pedagogical State University, Moscow 119991, Russia
  • 2B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, Kharkiv 61103, Ukraine
  • 3Faculty of Physics, University of Vienna, 1090 Vienna, Austria
  • 4Physics Department, V. Karazin Kharkiv National University, Kharkiv 61022, Ukraine
  • 5National Research University Higher School of Economics, Moscow 101000, Russia
  • 6Institute for Physics of Microstructures, Russian Academy of Sciences, Nizhny Novgorod GSP-105, Russia

  • *korneeva@rplab.ru

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Vol. 13, Iss. 2 — February 2020

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