Tailoring supercurrent confinement in graphene bilayer weak links
Rainer Kraft (Karlsruhe Institut für Technologie)
Jens Mohrmann (Karlsruhe Institut für Technologie)
Renjun Du (Karlsruhe Institut für Technologie)
Pranauv Balaji Selvasundaram (Technische Universität Darmstadt, Karlsruhe Institut für Technologie)
Muhammad Irfan (Kavli institute of nanoscience Delft, TU Delft - QN/Akhmerov Group, Pakistan Institute of Engineering and Applied Sciences)
Umut Nefta Kanilmaz (Karlsruhe Institut für Technologie)
Fan Wu (National University of Defense Technology, Karlsruhe Institut für Technologie)
Detlef Beckmann (Karlsruhe Institut für Technologie)
Hilbert Von Löhneysen (Karlsruhe Institut für Technologie)
Ralph Krupke (Technische Universität Darmstadt, Karlsruhe Institut für Technologie)
Anton Akhmerov (TU Delft - QN/Akhmerov Group, Kavli institute of nanoscience Delft)
Igor Gornyi (Karlsruhe Institut für Technologie, Ioffe Institute)
Romain Danneau (Karlsruhe Institut für Technologie)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
Abstract
The Josephson effect is one of the most studied macroscopic quantum phenomena in condensed matter physics and has been an essential part of the quantum technologies development over the last decades. It is already used in many applications such as magnetometry, metrology, quantum computing, detectors or electronic refrigeration. However, developing devices in which the induced superconductivity can be monitored, both spatially and in its magnitude, remains a serious challenge. In this work, we have used local gates to control confinement, amplitude and density profile of the supercurrent induced in one-dimensional nanoscale constrictions, defined in bilayer graphene-hexagonal boron nitride van der Waals heterostructures. The combination of resistance gate maps, out-of-equilibrium transport, magnetic interferometry measurements, analytical and numerical modelling enables us to explore highly tunable superconducting weak links. Our study opens the path way to design more complex superconducting circuits based on this principle, such as electronic interferometers or transition-edge sensors.
help_outline