Journal Article

FZJ-2024-03013

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Tuning the supercurrent distribution in parallel ballistic graphene Josephson junctions

Schmidt, P. (Corresponding author)FZJ* ; Banszerus, L.RWTH* ; Frohn, B.FZJ* ; Blien, S. ; Watanabe, K. ; Taniguchi, T. ; Hüttel, A. K. ; Beschoten, B.RWTH* ; Hassler, F.RWTH* ; Stampfer, C.FZJ*

2023
American Physical Society College Park, Md. [u.a.]

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Please use a persistent id in citations: doi:10.1103/PhysRevApplied.20.054049  doi:10.34734/FZJ-2024-03013

Abstract: We report on a ballistic and fully tunable Josephson-junction system consisting of two parallel ribbons of graphene in contact with superconducting molybdenum-rhenium. By electrostatic gating of the two individual graphene ribbons, we gain control over the real-space distribution of the superconducting current density, which can be continuously tuned between the two ribbons. We extract the respective gate-dependent spatial distributions of the real-space current density by employing Fourier and Hilbert transformations of the magnetic-field-induced modulation of the critical current. This approach is fast and does not rely on a symmetric current profile. It is therefore a universally applicable tool, potentially useful for carefully adjusting Josephson junctions.

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Contributing Institute(s):

1. Halbleiter-Nanoelektronik (PGI-9)
2. JARA Institut Quanteninformation (PGI-11)
3. JARA-FIT (JARA-FIT)
4. Jara-Institut Quantum Information (INM-11)

Research Program(s):

1. 5221 - Advanced Solid-State Qubits and Qubit Systems (POF4-522) (POF4-522)
2. 5222 - Exploratory Qubits (POF4-522) (POF4-522)
3. DFG project 390534769 - EXC 2004: Materie und Licht für Quanteninformation (ML4Q) (390534769) (390534769)
4. GrapheneCore3 - Graphene Flagship Core Project 3 (881603) (881603)
5. 2D4QT - 2D Materials for Quantum Technology (820254) (820254)
6. DFG project 438638106 - Quantentransport in Nanoröhren: Einzelelektron-Optomechanik und neuartige Materialien (438638106) (438638106)

Appears in the scientific report 2024

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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