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Asymmetry in the effect of magnetic field on photon detection and dark counts in bended nanostrips

Semenov, A. and Charaev, Ilya and Lusche, R and Ilin, Konstantin and Siegel, Michael and Hübers, Heinz-Wilhelm and Bralovic, N and Dopf, K and Vodolazov, Denis (2015) Asymmetry in the effect of magnetic field on photon detection and dark counts in bended nanostrips. Physical Review B, 92, e174518. American Physical Society. doi: 10.1103/PhysRevB.92.174518. ISSN 1098-0121.

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Current crowding in the bends of superconducting nanostructures not only restricts measurable critical current in such structures, but also redistributes local probabilities for the appearance of dark and light counts. Using structures in the form of a square spiral, where all bends have the same symmetry with respect to the directions of the bias current and external magnetic field, we have shown that areas around the bends largely contribute to the rate of dark counts and to the rate of light counts at small photon energies. The minimum in the rate of dark counts reproduces the asymmetry of the maximum in the critical current as a function of the magnetic field. Contrarily, the minimum in the rate of light counts demonstrates opposite asymmetry. The rate of light counts becomes symmetric at large currents and fields. Comparison of the computed local absorption probabilities for photons and the simulated local threshold detection current reveal the areas near bends that deliver the asymmetric rate of light counts. Asymmetry in count rates is absent in circular spirals without bends.

Item URL in elib:https://elib.dlr.de/102546/
Document Type:Article
Title:Asymmetry in the effect of magnetic field on photon detection and dark counts in bended nanostrips
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Semenov, A.alexei.semenov (at) dlr.deUNSPECIFIED
Charaev, IlyaUniversity of KarlsruheUNSPECIFIED
Lusche, Rrobert.lusche (at) dlr.deUNSPECIFIED
Ilin, KonstantinUniversity of KarlsruheUNSPECIFIED
Siegel, MichaelUniversität KarlsruheUNSPECIFIED
Hübers, Heinz-Wilhelmheinz-wilhelm.huebers (at) dlr.deUNSPECIFIED
Bralovic, NUniversity of KarlsruheUNSPECIFIED
Dopf, KUniversity of KarlsruheUNSPECIFIED
Vodolazov, DenisInstitute for Physics of Microstructures, Russian Academy of Sciences, 603950, Nizhny Novgorod, GSP-105, RussiaUNSPECIFIED
Date:17 November 2015
Journal or Publication Title:Physical Review B
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
DOI :10.1103/PhysRevB.92.174518
Page Range:e174518
Publisher:American Physical Society
Keywords:Bended superconducting nanowires, photon detection, magnetic fields, asymmetry
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space System Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Space System Technology
DLR - Research theme (Project):R - Systemtechnologien (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems
Deposited By: Semenov, Prof.Dr. Alexey
Deposited On:27 Jan 2016 12:23
Last Modified:06 Sep 2019 15:29

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