Regensburg 2022 – scientific programme
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O: Fachverband Oberflächenphysik
O 57: Poster Wednesday: Electronic Structure
O 57.1: Poster
Wednesday, September 7, 2022, 18:00–20:00, P4
Josephson effect in the two-band superconductor Niobium Diselenide — •Xianzhe Zeng1, Haonan Huang1, Sujoy Karan1, Klaus Kern1,2, and Christian Ast1 — 1Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, 70569 Stuttgart, Germany — 2Institut de Physique, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
Niobium Diselenide is a two-dimensional (2D) van der Waals s-wave superconductor that can be described by a two-band model. The Josephson effect between Niobium Diselenide and another known BCS superconductor is non-trivial since it involves Copper pair tunneling of two bands with different order parameters. Here, we measure quasiparticle tunneling as well as the Josephson current between a clean superconducting Niobium Diselenide surface and a superconducting Vanadium tip using low-temperature scanning tunneling microscopy and spectroscopy. We analyze our results with the McMillan formula for a two-band superconductor. Our observations present a first step towards understanding more complicated scenarios, such as the predicted p-wave triplet superconductivity in Chromium Tribromide islands on Niobium Diselenide.