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Superconducting fluctuations and characteristic time scales in amorphous WSi

Zhang, Xiaofu and Lita, Adriana E. and Sidorova, Maria and Verma, Varun B. and Wang, Qiang and Nam, Sae Woo and Semenov, Alexey and Schilling, Andreas (2018) Superconducting fluctuations and characteristic time scales in amorphous WSi. Physical Review B, 97 (174502), p. 7. American Physical Society. DOI: 10.1103/PhysRevB.97.174502 ISSN 1098-0121

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Abstract

We study magnitudes and temperature dependencies of the electron-electron and electron-phonon interaction times which play the dominant role in the formation and relaxation of photon-induced hotspots in two-dimensional amorphous WSi films. The time constants are obtained through magnetoconductance measurements in a perpendicular magnetic field in the superconducting fluctuation regime and through time-resolved photoresponse to optical pulses. The excess magnetoconductivity is interpreted in terms of the weak-localization effect and superconducting fluctuations. Aslamazov-Larkin and Maki-Thompson superconducting fluctuations alone fail to reproduce the magnetic field dependence in the relatively high magnetic field range when the temperature is rather close to Tc because the suppression of the electronic density of states due to the formation of short-lifetime Cooper pairs needs to be considered. The time scale τi of inelastic scattering is ascribed to a combination of electron-electron (τe-e) and electron-phonon (τe-ph) interaction times, and a characteristic electron-fluctuation time (τe-f l), which makes it possible to extract theirmagnitudes and temperature dependencies from the measured τi . The ratio of phonon-electron (τph-e) and electron-phonon interaction times is obtained via measurements of the optical photoresponse of WSi microbridges. Relatively large τe-ph/τph-e and τe-ph/τe-e ratios ensure that in WSi the photon energy is more efficiently confined in the electron subsystem than in other materials commonly used in the technology of superconducting nanowire single-photon detectors (SNSPDs). We discuss the impact of interaction times on the hotspot dynamics and compare relevant metrics of SNSPDs from different materials.

Item URL in elib:https://elib.dlr.de/119870/
Document Type:Article
Title:Superconducting fluctuations and characteristic time scales in amorphous WSi
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Zhang, XiaofuUniversität ZürichUNSPECIFIED
Lita, Adriana E.NIST Boulder USAUNSPECIFIED
Sidorova, MariaMariia.Sidorova (at) dlr.deUNSPECIFIED
Verma, Varun B.NIST Boulder USAUNSPECIFIED
Wang, QiangUniversität ZürichUNSPECIFIED
Nam, Sae WooNIST Boulder USAUNSPECIFIED
Semenov, AlexeyAlexei.Semenov (at) dlr.deUNSPECIFIED
Schilling, AndreasUniversity of ZürichUNSPECIFIED
Date:1 May 2018
Journal or Publication Title:Physical Review B
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:97
DOI :10.1103/PhysRevB.97.174502
Page Range:p. 7
Publisher:American Physical Society
ISSN:1098-0121
Status:Published
Keywords:superconducting fluctuation, electron scattering times, WSi thin films
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Optische Technologien und Anwendungen
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems > Terahertz and Laser Spectroscopy
Deposited By: Semenov, Prof.Dr. Alexey
Deposited On:07 May 2018 10:03
Last Modified:06 Sep 2019 15:29

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