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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.

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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)