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Tailoring supercurrent confinement in graphene bilayer weak links

Kraft, Rainer ; Mohrmann, Jens ; Du, Renjun ; Selvasundaram, Pranauv Balaji ; Irfan, Muhammad ; Kanilmaz, Umut Nefta ; Wu, Fan ; Beckmann, Detlef ; Löhneysen, Hilbert von ; Krupke, Ralph ; Akhmerov, Anton ; Gornyi, Igor ; Danneau, Romain (2018):
Tailoring supercurrent confinement in graphene bilayer weak links.
In: Nature Communications, 9 (1), p. 1722. Springer Nature, ISSN 2041-1723,
DOI: 10.1038/s41467-018-04153-4,
[Article]

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.

Item Type: Article
Erschienen: 2018
Creators: Kraft, Rainer ; Mohrmann, Jens ; Du, Renjun ; Selvasundaram, Pranauv Balaji ; Irfan, Muhammad ; Kanilmaz, Umut Nefta ; Wu, Fan ; Beckmann, Detlef ; Löhneysen, Hilbert von ; Krupke, Ralph ; Akhmerov, Anton ; Gornyi, Igor ; Danneau, Romain
Title: Tailoring supercurrent confinement in graphene bilayer weak links
Language: English
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.

Journal or Publication Title: Nature Communications
Journal volume: 9
Number: 1
Publisher: Springer Nature
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Fachgebiet Molekulare Nanostrukturen
Date Deposited: 20 Nov 2020 12:14
DOI: 10.1038/s41467-018-04153-4
Official URL: https://www.nature.com/articles/s41467-018-04153-4
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