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 Rotzinger^1,2, and Alexey V. Ustinov^1,2,3,4 — ¹Physikalisches 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)