SKM 2021 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 7: Focus Session: Disordered and Granular Superconductors: Fundamentals and Applications in Quantum Technology II
TT 7.6: Talk
Tuesday, September 28, 2021, 15:30–15:45, H6
Disordered superconducting NbN thin films and their quantum device application — •Evgeni Il'ichev1, Sven Linzen1, Oleg Astafiev2,3, Rais Shaikhaidarov3, Kyungho Kim3, Jacob Dunstan3, Ilya Antonov3, Vladimir Antonov2,3, Mario Ziegler1, Gregor Oelsner1, and Ronny Stolz1 — 1Leibniz Institute of Photonic Technology, Jena, Germany — 2Skolkovo Institute of Science and Technology, Bolshoy Boulevard 30, bld. 1, Moscow, Russia 121205 — 3Physics Department, Royal Holloway, University of London, United Kingdom
Within the past years we optimized and studied the properties of superconducting niobium nitride films fabricated with plasma-enhanced atomic layer deposition (PEALD). The films are polycrystalline and consist mainly of cubic δ-niobium-nitride grains of only a few nanometers in size. A superconductor to insulator transition (SIT) can be observed within ultrathin PEALD-NbN films by reducing the film thickness from 3.1 to 2.8 nm. Well-adjusting the film thickness slightly above the SIT point the films show high values of the kinetic inductance and the normal state resistance. Such films were used to fabricate nanowires in which the coherent quantum phase slips (CQPS) can be observed. Observation of the Aharonov-Casher effect as well as the dynamics of the CQPS are discussed.
This work was supported by European Union Horizon 2020 Research and Innovation Programme under Grant No. 862660/QUANTUM E-LEAPS.