SKM 2021 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 6: Focus Session: Emerging Phenomena in Superconducting Low Dimensional Hybrid Systems I

TT 6.2: Vortrag

Dienstag, 28. September 2021, 10:30–11:00, H7

Tunneling Spectroscopy of Layered Superconductors — •Hadar Steinberg — Hebrew University of Jerusalem, Jerusalem, Israel

Tunnel junctions consisting of van der Waals (vdW) materials are realized by placement of thin barriers on top layered superconductors such as NbSe₂, TaS₂, and others. The atomic mating of the tunnel barrier and superconductor gives rise to a stable junction, which allows probing of the spectrum at high resolution, revealing clear signatures of the quasiparticle structure and of the sub-gap features. I will show how the use of such devices allows us to differentiate between dynamic properties of carriers in multi-gap superconductors. At ultrathin superconductors, we are able to track the evolution of the gap function up to very high in-plane magnetic field, where the gap feature hints at the onset of a triplet order. I will also show how defects in the barriers can give rise to quantum dot states, which can couple to the superconductor, forming Andreev bound states, and can be utilized as energy probes. Finally, I will show new data demonstrating the use of NbSe₂ as a source-drain electrode in a graphene-based Josephson device, which can sustain high in-plane fields.