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TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity - Poster Session

TT 30.56: Poster

Montag, 31. März 2014, 15:00–19:00, P2

Collective Quantum Phase-Slip Dynamics in Superconding Nanowire Arrays — •Sebastian T. Skacel¹, Jan N. Voss¹, Tobias Bier¹, Lucas Radke¹, Martin Weides¹, Hannes Rotzinger¹, Hans E. Mooij^2,3, and Alexey V. Ustinov^1,2 — ¹Physikalisches Institut, Karlsruher Institut für Technologie, D-76131 Karlsruhe, Germany — ²Center for Functional Nanostructures, Karlsruher Institut für Technologie, D-76128 Karlsruhe, Germany — ³Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, The Netherlands

Superconducting nanowire arrays exhibit quantum phase-slip (QPS) phenomenon if the superconductor has a very high normal-state sheet resistance. We experimentally study QPS effects in arrays of nanowires embedded in a resonant circuit at GHz frequencies. We probe this circuit at ultra-low microwave power, applied flux and mK temperatures. The nanowires are fabricated utilizing aluminium grown in a precisely-controlled oxygen atmosphere. In this way, we aim to control the QPS rate for a given wire width. The wires are defined with conventional electron beam lithography down to a width of 20 nm. We will present the fabrication of the nanowire arrays and first microwave measurements at mK temperatures.