Supercurrent in Graphene Josephson Junctions with Narrow Trenches in the Quantum Hall Regime
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 articlePermalink
https://hdl.handle.net/10161/19631Published Version (Please cite this version)
10.1557/adv.2018.469Publication 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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Show full item recordScholars@Duke
Anne Draelos
Postdoctoral Associate
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.
Andrew Seredinski
Research Assistant, Ph D Student
Ming-Tso Wei
Student
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