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.

Details

Title
Tailoring supercurrent confinement in graphene bilayer weak links
Author
Kraft, Rainer 1 ; Mohrmann, Jens 1 ; Du, Renjun 1 ; Pranauv, Balaji Selvasundaram 2 ; Muhammad Irfan 3 ; Kanilmaz, Umut Nefta 4 ; Wu, Fan 5 ; Beckmann, Detlef 1 ; Hilbert von Löhneysen 6 ; Krupke, Ralph 2 ; Akhmerov, Anton 7   VIAFID ORCID Logo  ; Gornyi, Igor 8 ; Danneau, Romain 1 

1  Institute of Nanotechnology, Karlsruhe Institute of Technology, Karlsruhe, Germany 
2  Institute of Nanotechnology, Karlsruhe Institute of Technology, Karlsruhe, Germany; Department of Materials and Earth Sciences, Technical University Darmstadt, Darmstadt, Germany 
3  Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands; Department of Physics and Applied Mathematics, Pakistan Institute of Engineering and Applied Sciences, Nilore, Islamabad, Pakistan 
4  Institute of Nanotechnology, Karlsruhe Institute of Technology, Karlsruhe, Germany; Institute for Condensed Matter Theory, Karlsruhe Institute of Technology, Karlsruhe, Germany 
5  Institute of Nanotechnology, Karlsruhe Institute of Technology, Karlsruhe, Germany; College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha, China 
6  Institute of Nanotechnology, Karlsruhe Institute of Technology, Karlsruhe, Germany; Institute of Physics, Karlsruhe Institute of Technology, Karlsruhe, Germany; Institute for Solid State Physics, Karlsruhe Institute of Technology, Karlsruhe, Germany 
7  Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands 
8  Institute of Nanotechnology, Karlsruhe Institute of Technology, Karlsruhe, Germany; Institute for Condensed Matter Theory, Karlsruhe Institute of Technology, Karlsruhe, Germany; A.F. Ioe Physico-Technical Institute, St. Petersburg, Russia 
Pages
1-8
Publication year
2018
Publication date
Apr 2018
Publisher
Nature Publishing Group
e-ISSN
20411723
Source type
Scholarly Journal
Language of publication
English
DOI
https://doi.org/10.1038/s41467-018-04153-4
ProQuest document ID
2032751569
Copyright
© 2018. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.