Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 103: Transport: Poster Session

TT 103.9: Poster

Donnerstag, 19. März 2015, 15:00–18:00, Poster B

DC transport measurements of aluminium-oxide nanowire arrays — •Marco Pfirrmann¹, Sebastian T. Skacel¹, Jan N. Voss¹, Julian Münzberg¹, Martin Weides^1,2, Hannes Rotzinger¹, Hans E. Mooij^1,3, and Alexey V. Ustinov^1,4 — ¹Physikalisches Institut, Kalsruhe Institut of Technology, Wolgang-Gaede-Straße 1, D-76131 Karlsruhe, Germany — ²Institute of Physics, Johannes Gutenberg University Mainz, Staudinger Weg 7 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

We experimentally investigate superconducting aluminium-oxide nanowires with a focus on coherent quantum phase slips. In duality to the Josephson effect where two superconductors are weakly coupled through the tunneling of Cooper pairs, the tunneling of the phase across a nanowire leads to the quantum phase slip effect. We are interested in the DC transport properties of arrays of aluminium-oxide nanowires, where we expect to see spurs of quantum vortex dynamics in the I-V characteristics in dependence on the applied magnetic field. The high-resistive aluminium-oxide thin films are deposited by precise control of a reactive Al sputter plasma in oxygen atmosphere. Electron-beam lithography and reactive ion etching is used to define the nanowires. We present fabrication details and first measurement results of the parallel arrays of nanowires at mK temperatures.