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Complete gate control of supercurrent in graphene p–n junctions

Author

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  • Jae-Hyun Choi

    (Pohang University of Science and Technology
    Present address: Memory Division, Samsung Electronics Co. LTD., Hwasung 445-701, Republic of Korea)

  • Gil-Ho Lee

    (Pohang University of Science and Technology)

  • Sunghun Park

    (Korea Advanced Institute of Science and Technology)

  • Dongchan Jeong

    (Pohang University of Science and Technology
    Present address: Semiconductor R&D Center, Samsung Electronics Co. LTD., Hwasung 445-701, Republic of Korea)

  • Jeong-O Lee

    (NanoBio Fusion Research Center, Korea Research Institute of Chemical Technology)

  • H.-S. Sim

    (Korea Advanced Institute of Science and Technology)

  • Yong-Joo Doh

    (Pohang University of Science and Technology
    Korea University Sejong Campus)

  • Hu-Jong Lee

    (Pohang University of Science and Technology)

Abstract

In a conventional Josephson junction of graphene, the supercurrent is not turned off even at the charge neutrality point, impeding further development of superconducting quantum information devices based on graphene. Here we fabricate bipolar Josephson junctions of graphene, in which a p–n potential barrier is formed in graphene with two closely spaced superconducting contacts, and realize supercurrent ON/OFF states using electrostatic gating only. The bipolar Josephson junctions of graphene also show fully gate-driven macroscopic quantum tunnelling behaviour of Josephson phase particles in a potential well, where the confinement energy is gate tuneable. We suggest that the supercurrent OFF state is mainly caused by a supercurrent dephasing mechanism due to a random pseudomagnetic field generated by ripples in graphene, in sharp contrast to other nanohybrid Josephson junctions. Our study may pave the way for the development of new gate-tuneable superconducting quantum information devices.

Suggested Citation

  • Jae-Hyun Choi & Gil-Ho Lee & Sunghun Park & Dongchan Jeong & Jeong-O Lee & H.-S. Sim & Yong-Joo Doh & Hu-Jong Lee, 2013. "Complete gate control of supercurrent in graphene p–n junctions," Nature Communications, Nature, vol. 4(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms3525
    DOI: 10.1038/ncomms3525
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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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