Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 80: Poster: Scanning Probe Techniques - Method Development
O 80.17: Poster
Wednesday, March 14, 2018, 18:15–20:30, Poster A
Coupling microwave radiation into an STM Josephson junction — Nils Bogdanoff1, •Olof Peters1, Gaël Reecht1, Clemens B. Winkelmann2, and Katharina J. Franke1 — 1Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 2Univ. Grenoble Alpes, Institut Neél, 25 Avenue des Martyrs, 38042 Grenoble, France
Josephson junctions (JJ) have been extensively studied as promising elements in quantum mechanical circuits. Combining them with the high spatial resolution of a scanning tunneling microscope (STM) would allow for the local investigation of the superconducting groundstate close to magnetic defects. We present a current-biased JJ formed between Pb tip and Pb sample in a T=1.3 K STM.
Microwave frequencies of up to f=26 GHz can be introduced into the junction using coaxial cables. The Josephson current responds to the irradiation by showing multiple frequency- and power-dependent steps. Simulations allow to distinguish their origin between coherent and incoherent as well as Cooper pair- and quasiparticle-based processes.