Dresden 2020 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 55: Superconductivity: Tunnelling and Josephson Junctions
TT 55.10: Talk
Thursday, March 19, 2020, 12:15–12:30, HSZ 204
Transport signatures of the Higgs mode in a normal-superconductor junction — •Gaomin Tang1, Wolfgang Belzig2, Ulrich Zülicke3, and Christoph Bruder1 — 1Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland — 2Fachbereich Physik, Universität Konstanz, D-78457 Konstanz, Germany — 3School of Chemical and Physical Sciences and MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, P.O. Box 600, Wellington 6140, New Zealand
The magnitude of the superconducting order parameter can be excited to oscillate under certain resonant conditions. We study the fingerprints of this so-called amplitude, or Higgs, mode in the transport properties of a voltage biased normal-superconductor tunnel junction when the superconducting contact is exposed to microwave radiation. As a key signature, the AC charge current at fixed voltage bias shows pronounced resonant behaviour when the microwave frequency coincides with the static part of the superconducting-gap amplitude. We also find an interesting nonmonotonic behavior of the AC charge current with increasing DC voltage bias.