Berlin 2018 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 99: Poster Session: Transport
TT 99.38: Poster
Thursday, March 15, 2018, 15:00–19:00, Poster B
Superconducting and insulating behaviour in granular aluminium oxide nano-wires — •Jan Nicolas Voss1, Yannick Schön1, Dominik Dorer1, Micha Wildermuth1, Sebastian T. Skacel1, Hannes Rotzinger1, and Alexey V. Ustinov1,2 — 1Physikalisches Institut, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany — 2Russian Quantum Center, National University of Science and Technology MISIS, Moscow 119049, Russia
Granular aluminium oxide (AlOx) nano-wires are a promising alternative to Josephson tunnel junctions as a non-linear element in superconducting quantum circuits. Due to the internal structure, the sheet resistance of this material can be adjusted over a wide kOhm range [1].
Due to the high flexibility of this approach, we employ an electron beam lithography nano-fabrication process, with the intention of being used for highly coherent superconducting quantum circuits. The fabricated 20 nm wide nano-wires have a very clean interface to the sapphire substrate and no remaining fabrication residue in the vicinity of the circuit.
Experimentally, we explore the phase transition from superconducting to insulating behavior in nano-wires with a length span between 50 nm and 1 µm.
H. Rotzinger, S. T. Skacel, M. Pfirrmann, J. N. Voss, J. Müunzberg, S. Probst, P. Bushev, M. P. Weides, A. V. Ustinov and J. E. Mooij, Supercond. Sci. Technol. 30, 025002 (2016)