Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 21: Superconductivity: Poster Session

TT 21.47: Poster

Monday, March 16, 2015, 15:00–18:00, Poster B

Quantum Phase-Slips in Superconducting AlO_x Nanowire Arrays at Microwave Frequencies — •Sebastian T. Skacel¹, Marco Pfirrmann¹, Jan N. Voss¹, Julian Münzberg¹, Lucas Radtke¹, Sebastian Probst¹, Martin Weides^1,2, Hannes Rotzinger¹, Hans E. Mooij^1,3, and Alexey V. Ustinov^1,4 — ¹Physikalisches Institut, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany — ²Institute of Physics, Johannes Gutenberg University Mainz, D-55128 Mainz, Germany — ³Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, The Netherlands — ⁴Russian Quantum Center, 100 Novaya St., Skolkovo, Moscow region, 143025, Russia

Superconducting nanowires in the quantum phase slip (QPS) regime allow to study the flux and phase dynamics in duality to Josephson junction systems. However, due to the vanishing self-capacitance of the nanowires, the microwave response significantly differs. We experimentally study parallel arrays of nanowires which are embedded in a resonant circuit at GHz frequencies. The samples are probed at ultra-low microwave power and applied magnetic field at mK temperatures. The AlO_x nanowires, with a sheet resistance in the kΩ range, are fabricated by sputter deposition of aluminium in a controlled oxygen atmosphere. The wires are defined with conventional electron beam lithography down to a width of approximately 15 nm. We present the fabrication of the nanowire arrays and measurement results for arrays coupled to superconducting microwave resonators.