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SKM 2021 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 7: Focus Session: Disordered and Granular Superconductors: Fundamentals and Applications in Quantum Technology II

TT 7.8: Vortrag

Dienstag, 28. September 2021, 16:00–16:15, H6

Eliminating Quantum Phase Slips in Superconducting Nanowires — •Jan Nicolas Voss1, Yannick Schön1, Micha Wildermuth1, Hannes Rotzinger1,2, and Alexey V. Ustinov1,2,3,41Physikalisches Institut, Karlsruher Institut für Technologie, Karlsruhe, Germany — 2Institut für Quantenmaterialien und Technologien (IQMT), Karlrsruher Institut für Technologie, Karlsruhe, Germany — 3Russian Quantum Center, Skolkovo, Moscow, Russia — 4National University of Science and Technology MISIS, Moscow, Russia

Superconducting nanowires made from granular aluminium have unique electrical properties at low temperatures. They originate from the intrinsic network of Josephson junctions in the material and the spatial restrictions to dimensions that are of the order of the superconducting coherence length. We present a novel method, which allows changing the nanowire resistance by modifying the intrinsic junction network by electrical pulses.

At low temperatures, we have observed a transition from an insulating over a metallic to a superconducting response in about a two hundred individual resistance steps. The measurement results are compared with the quantum phase slip model for superconducting nanowires [1].
[1] J. N. Voss, Y. Schön, M. Wildermuth, D. Dorer, J. H. Cole, H. Rotzinger and A. V. Ustinov, ACS Nano 15, 4108 (2021)

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