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Supercurrent in Graphene Josephson Junctions with Narrow Trenches in the Quantum Hall Regime

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Date
2018-01-01
Authors
Seredinski, A
Draelos, A
Wei, MT
Ke, CT
Fleming, T
Mehta, Y
Mancil, E
Li, H
Taniguchi, T
Watanabe, K
Tarucha, S
Yamamoto, M
Borzenets, IV
Amet, F
Finkelstein, G
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(15 total)
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Abstract
© 2018 Materials Research Society. Coupling superconductors to quantum Hall edge states is the subject of intense investigation as part of the ongoing search for non-abelian excitations. Our group has previously observed supercurrents of hundreds of picoamperes in graphene Josephson junctions in the quantum Hall regime. One of the explanations of this phenomenon involves the coupling of an electron edge state on one side of the junction to a hole edge state on the opposite side. In our previous samples, these states are separated by several microns. Here, a narrow trench perpendicular to the contacts creates counterpropagating quantum Hall edge channels tens of nanometres from each other. Transport measurements demonstrate a change in the low-field Fraunhofer interference pattern for trench devices and show a supercurrent in both trench and reference junctions in the quantum Hall regime. The trench junctions show no enhancement of quantum Hall supercurrent and an unexpected supercurrent periodicity with applied field, suggesting the need for further optimization of device parameters.
Type
Journal article
Permalink
https://hdl.handle.net/10161/19631
Published Version (Please cite this version)
10.1557/adv.2018.469
Publication Info
Seredinski, A; Draelos, A; Wei, MT; Ke, CT; Fleming, T; Mehta, Y; ... Finkelstein, G (2018). Supercurrent in Graphene Josephson Junctions with Narrow Trenches in the Quantum Hall Regime. MRS Advances, 3(47-48). pp. 2855-2864. 10.1557/adv.2018.469. Retrieved from https://hdl.handle.net/10161/19631.
This is constructed from limited available data and may be imprecise. To cite this article, please review & use the official citation provided by the journal.
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Scholars@Duke

Draelos

Anne Draelos

Postdoctoral Associate
Finkelstein

Gleb Finkelstein

Professor of Physics
Gleb Finkelstein is an experimentalist interested in physics of quantum nanostructures, such as Josephson junctions and quantum dots made of carbon nanotubes, graphene, and topological materials. These objects reveal a variety of interesting electronic properties that may form a basis for future quantum devices.
Seredinski

Andrew Seredinski

Research Assistant, Ph D Student
Wei

Ming-Tso Wei

Student
Alphabetical list of authors with Scholars@Duke profiles.
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