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

Published online by Cambridge University Press:  28 May 2018

Andrew Seredinski ,
Anne Draelos ,
Ming-Tso Wei ,
Chung-Ting Ke ,
Tate Fleming ,
Yash Mehta ,
Ethan Mancil ,
Hengming Li ,
Takashi Taniguchi  and
Kenji Watanabe
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Andrew Seredinski*
Affiliation:
Department of Physics, Duke University, Durham, NC 27708, U.S.A.
Anne Draelos
Affiliation:
Department of Physics, Duke University, Durham, NC 27708, U.S.A.
Ming-Tso Wei
Affiliation:
Department of Physics, Duke University, Durham, NC 27708, U.S.A.
Chung-Ting Ke
Affiliation:
Department of Physics, Duke University, Durham, NC 27708, U.S.A.
Tate Fleming
Affiliation:
Department of Physics and Astronomy, Appalachian State University, Boone, NC 28607, U.S.A.
Yash Mehta
Affiliation:
Department of Physics and Astronomy, Appalachian State University, Boone, NC 28607, U.S.A.
Ethan Mancil
Affiliation:
Department of Physics and Astronomy, Appalachian State University, Boone, NC 28607, U.S.A.
Hengming Li
Affiliation:
Department of Physics and Astronomy, Appalachian State University, Boone, NC 28607, U.S.A.
Takashi Taniguchi
Affiliation:
Advanced Materials Laboratory, NIMS, Tsukuba 305-0044, Japan
Kenji Watanabe
Affiliation:
Advanced Materials Laboratory, NIMS, Tsukuba 305-0044, Japan
Seigo Tarucha
Affiliation:
Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 1-8656, Japan Center for Emergent Matter Science (CEMS), RIKEN, Wako-shi, Saitama 351-0198, Japan
Michihisa Yamamoto
Affiliation:
Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 1-8656, Japan Center for Emergent Matter Science (CEMS), RIKEN, Wako-shi, Saitama 351-0198, Japan
Ivan V. Borzenets
Affiliation:
Department of Physics, City University of Hong Kong, Kowloon, Hong Kong SAR
François Amet
Affiliation:
Department of Physics and Astronomy, Appalachian State University, Boone, NC 28607, U.S.A.
Gleb Finkelstein
Affiliation:
Department of Physics, Duke University, Durham, NC 27708, U.S.A.
*
*Corresponding author: Andrew Seredinski (ams168@duke.edu)
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Abstract

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.

Keywords

grapheneHall effectsuperconducting
Type
Articles
Information
MRS Advances , Volume 3 , Issue 47-48: Nanomaterials , 2018 , pp. 2855 - 2864
Copyright
Copyright © Materials Research Society 2018 

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