Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 31: Superconducting Electronics: SQUIDs, Qubits, Circuit QED, Quantum Coherence and Quantum Information Systems 1

TT 31.10: Vortrag

Mittwoch, 18. März 2020, 12:00–12:15, HSZ 03

Resistance tuning of disordered nanowires by current pulses and their electrical response at low temperatures — •Jan Nicolas Voss¹, Yannick Schön¹, Micha Wildermuth¹, Hannes Rotzinger^1,2, and Alexey V. Ustinov^1,3,4 — ¹Physikalisches Institut, Karlsruher Institut für Technologie, Karlsruhe, Germany — ²Institut für Festkörperphysik, Karlsruher 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. With this method, we test the quantum phase slip model for the wires at millikelvin 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 theoretical predictions.