Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 58: Superconductivity: Qubits 2

TT 58.6: Vortrag

Donnerstag, 4. April 2019, 16:15–16:30, Theater

Metallic, superconducting and insulating low-temperature transport properties of disordered nanowires — •Jan Nicolas Voss¹, Yannick Schön¹, Micha Wildermuth¹, Lukas Powalla¹, Hannes Rotzinger¹, and Alexey V. Ustinov^1,2 — ¹Physikalisches Institut, Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany — ²Russian Quantum Center, National University of Science and Technology MISIS, Moscow 119049, Russia

Lithographically fabricated nanowires are a promising alternative to Josephson tunnel junctions as a nonlinear element in superconducting quantum circuits. They potentially offer low intrinsic loss, high impedance, and low fabrication requirements. In the superconducting regime, a key requirement is a high kinetic inductance stemming from a low normal state conductance. Our nanowire material of choice is disordered oxidized aluminum, which, depending on the implanted oxygen impurities, allows for implementing a wide range of resistivities. Microscopically the material forms a natural, disordered network of nanometer-sized aluminum grains that are separated by thin aluminum-oxide barriers. Given this nanoscale morphology, the transport at very low temperatures ranges from insulating to superconducting depending on the resistance of the wires. We will present experimental results on nanowires with a length ranging from 50 nm up to 1000 nm and a width of about 20 nm and compare the measured data with theoretical predictions.