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Ballistic-like supercurrent in suspended graphene Josephson weak links

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  • Naomi Mizuno

    (Stony Brook University
    Present address: Department of Physics, the City College of New York, New York 10031, USA)

  • Bent Nielsen

    (Stony Brook University)

  • Xu Du

    (Stony Brook University)

Abstract

The interplay of the massless Dirac fermions in graphene and the Cooper pair states in a superconductor has the potential to give rise to exotic physical phenomena and useful device applications. But to date, the junctions formed between graphene and superconductors on conventional substrates have been highly disordered. Charge scattering and potential fluctuations caused by such disorder are believed to have prevented the emergence or observation of new physics. Here we propose to address this problem by forming suspended graphene–superconductor junctions. We demonstrate the fabrication of high-quality suspended monolayer graphene–NbN Josephson junctions with device mobility in excess of 150,000 cm2 per Vs, minimum carrier density below 1010 cm−2, and the flow of a supercurrent at critical temperatures greater than 2 K. The characteristics of our Josephson junctions are consistent with ballistic transport, with a linear dependence on the Fermi energy that reflects of linear dispersion of massless Dirac fermions.

Suggested Citation

  • Naomi Mizuno & Bent Nielsen & Xu Du, 2013. "Ballistic-like supercurrent in suspended graphene Josephson weak links," Nature Communications, Nature, vol. 4(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms3716
    DOI: 10.1038/ncomms3716
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    Cited by:

    1. Spagnolo, B. & Valenti, D. & Guarcello, C. & Carollo, A. & Persano Adorno, D. & Spezia, S. & Pizzolato, N. & Di Paola, B., 2015. "Noise-induced effects in nonlinear relaxation of condensed matter systems," Chaos, Solitons & Fractals, Elsevier, vol. 81(PB), pages 412-424.

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