Tailoring supercurrent confinement in graphene bilayer weak links

Rainer Kraft, Jens Mohrmann, Renjun Du, Pranauv Balaji Selvasundaram, Muhammad Irfan, Umut Nefta Kanilmaz, Fan Wu, Detlef Beckmann, Hilbert Löhneysen, Ralph Krupke, Anton Akhmerov, Igor Gornyi and Romain Danneau ()
Additional contact information
Rainer Kraft: Karlsruhe Institute of Technology
Jens Mohrmann: Karlsruhe Institute of Technology
Renjun Du: Karlsruhe Institute of Technology
Pranauv Balaji Selvasundaram: Karlsruhe Institute of Technology
Muhammad Irfan: Delft University of Technology
Umut Nefta Kanilmaz: Karlsruhe Institute of Technology
Fan Wu: Karlsruhe Institute of Technology
Detlef Beckmann: Karlsruhe Institute of Technology
Hilbert Löhneysen: Karlsruhe Institute of Technology
Ralph Krupke: Karlsruhe Institute of Technology
Anton Akhmerov: Delft University of Technology
Igor Gornyi: Karlsruhe Institute of Technology
Romain Danneau: Karlsruhe Institute of Technology

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: 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.

Date: 2018
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DOI: 10.1038/s41467-018-04153-4

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