Radio-frequency response of a graphene Josephson junction based superconducting oscillator circuit

ORAL

Abstract

Ballistic transport in a graphene-based Josephson junction provides a great opportunity to realize different superconducting quantum circuits. Such circuits are tunable by various externally controllable knobs like - doping, electric field, magnetic field; hence, they can have the potential to be used as superconducting qubits over the existing ones which do not have such variety of tunability. We have devised a superconducting oscillator circuit, employing graphene-based Josephson junction. The analogous electrical circuit is a simple parallel LC oscillator, where the oscillator frequency is tunable through magnetic flux variation and carrier density modulation in graphene. The response of a Josephson junction as an inductor and its non-linearity is vital. The readout of the device involves coupling of an external RF signal to the oscillator through a reflection based measurement. Such a response can be promising for the future direction of graphene-based quantum devices.

*We acknowledge funding support from the Department of Atomic Energy and the Department of Science and Technology of India.

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Presenters

  • Joydip Sarkar

    • Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research (TIFR)

Authors

  • Subhamoy Ghatak

    • Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research (TIFR)

  • Joydip Sarkar

    • Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research (TIFR)

  • Pratap Adak

    • Tata Institute of Fundamental Research (TIFR)
    • Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research (TIFR)

  • Biswajit Datta

    • Materials, University of California, Santa Barbara
    • Materials Department, University of California, Santa Barbara

  • SUPRIYA MANDAL

    • Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research (TIFR)

  • Lucky N. Kapoor

    • Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research (TIFR)

  • Kishor V Salunkhe

    • Tata Inst of Fundamental Res
    • DCMP&MS, Tata Institute of Fundamental Research, Mumbai
    • Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research (TIFR)

  • Suman Kundu

    • DCMP&MS, Tata Institute of Fundamental Research, Mumbai
    • Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research (TIFR)

  • R Vijay

    • Tata Inst of Fundamental Res
    • Tata Institute of Fundamental Research, Mumbai
    • DCMP&MS, Tata Institute of Fundamental Research, Mumbai
    • Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research (TIFR)

  • Mandar M Deshmukh

    • Tata Institute of Fundamental Research (TIFR)
    • Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research (TIFR)