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

Publication ,  Journal Article
Seredinski, A; Draelos, A; Wei, MT; Ke, CT; Fleming, T; Mehta, Y; Mancil, E; Li, H; Taniguchi, T; Watanabe, K; Tarucha, S; Yamamoto, M ...
Published in: MRS Advances
January 1, 2018

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.

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Published In

MRS Advances

DOI

EISSN

2059-8521

Publication Date

January 1, 2018

Volume

3

Issue

47-48

Start / End Page

2855 / 2864

Related Subject Headings

  • 4018 Nanotechnology
  • 4016 Materials engineering
  • 3403 Macromolecular and materials chemistry
 

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Seredinski, A., Draelos, A., Wei, M. T., Ke, C. T., 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), 2855–2864. https://doi.org/10.1557/adv.2018.469
Seredinski, A., A. Draelos, M. T. Wei, C. T. Ke, T. Fleming, Y. Mehta, E. Mancil, et al. “Supercurrent in Graphene Josephson Junctions with Narrow Trenches in the Quantum Hall Regime.” MRS Advances 3, no. 47–48 (January 1, 2018): 2855–64. https://doi.org/10.1557/adv.2018.469.
Seredinski A, Draelos A, Wei MT, Ke CT, Fleming T, Mehta Y, et al. Supercurrent in Graphene Josephson Junctions with Narrow Trenches in the Quantum Hall Regime. MRS Advances. 2018 Jan 1;3(47–48):2855–64.
Seredinski, A., et al. “Supercurrent in Graphene Josephson Junctions with Narrow Trenches in the Quantum Hall Regime.” MRS Advances, vol. 3, no. 47–48, Jan. 2018, pp. 2855–64. Scopus, doi:10.1557/adv.2018.469.
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. Supercurrent in Graphene Josephson Junctions with Narrow Trenches in the Quantum Hall Regime. MRS Advances. 2018 Jan 1;3(47–48):2855–2864.
Journal cover image

Published In

MRS Advances

DOI

EISSN

2059-8521

Publication Date

January 1, 2018

Volume

3

Issue

47-48

Start / End Page

2855 / 2864

Related Subject Headings

  • 4018 Nanotechnology
  • 4016 Materials engineering
  • 3403 Macromolecular and materials chemistry