Collective Quantum Phase-Slip Dynamics in Superconducting Nanowire Arrays

POSTER

Abstract

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.

Authors

  • Sebastian T. Skacel

    • Physikalisches Institut, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany

  • Jan N. Voss

    • Physikalisches Institut, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany

  • Tobias Bier

    • Physikalisches Institut, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany

  • Lucas Radke

    • Physikalisches Institut, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany

  • Martin Weides

    • Physikalisches Institut, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany

  • Hannes Rotzinger

    • Physikalisches Institut, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany

  • Hans E. Mooij

    • Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, The Netherlands

  • Alexey V. Ustinov$^{1}$

    • Physikalisches Institut, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany