Probing Kinetic Inductance and Pairing Symmetries in Magic Angle Twisted Bilayer Graphene (Part 1)

ORAL

Abstract

The mechanism and pairing symmetry of superconductivity have always been at the forefront of the study of unconventional superconductors. The physics underlying the superconducting phases in magic-angle twisted bilayer graphene (MATBG) may provide revelatory insight beyond the moiré systems, and extend into other strongly-correlated systems such as high-TC superconductors. Here, we combine DC transport and circuit quantum electrodynamics (cQED) techniques to characterize the kinetic inductance and, consequently the superfluid density, within MATBG samples. The hybrid superconducting circuit grants access to collective behaviors of the superfluid ensemble across the entire MATBG region. In Part 1 of our talk, we will focus on the methodology of this experiment, including the design, simulations, and fabrication of the devices. We present DC and MW characterization to demonstrate gate-dependent microwave resonance that arises from the superconducting phase of MATBG. In part 2, we will present the temperature, DC bias current, and microwave power dependence of the superfluid density in MATBG samples and discuss their implication on the pairing symmetry in MATBG. We stress that the hybrid superconducting circuits demonstrated can be utilized to study other atomically thin 2D superconductors in both DC and AC regimes.

*This research was funded in part by the US Army Research Office grant no. W911NF-2210023, by the National Science Foundation QII-TAQS grant no. OMA-1936263, and by the Under Secretary of Defense for Research and Engineering under Air Force Contract No. FA8702-15-D-0001. The views and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of the US Government.

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Presenters

  • Joel I Wang

    • Massachusetts Institute of Technology MI
    • Massachusetts Institute of Technology

Authors

  • Joel I Wang

    • Massachusetts Institute of Technology MI
    • Massachusetts Institute of Technology

  • Miuko Tanaka

    • Massachusetts Institute of Technology MI
    • the University of Tokyo

  • Thao H Dinh

    • Harvard University
    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology

  • Daniel Rodan Legrain

    • Massachusetts Institute of Technology - MIT

  • Sameia Zaman

    • Massachusetts Institute of Technology MI
    • Massachusetts Institute of Technology
    • Massachusetts Institute of Technology (MIT)

  • Max Hays

    • MIT
    • Massachusetts Institute of Technology (MIT)
    • Massachusetts Institute of Technology MI
    • Massachusetts Institute of Technology
    • Massachussets Institute of Technology
    • Massachusetts Institute of Technology MIT

  • Michael A Gingras

    • MIT Lincoln Laboratory

  • Bethany Niedzielski

    • MIT Lincoln Laboratory

  • Hannah Stickler

    • MIT Lincoln Laboratory

  • Mollie E Schwartz

    • MIT Lincoln Laboratory

  • Jonilyn L Yoder

    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • Kenji Watanabe

    • National Institute for Materials Science
    • NIMS
    • Research Center for Electronic and Optical Materials, National Institute for Materials Science
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Material Science

  • Takashi Taniguchi

    • Kyoto Univ
    • National Institute for Materials Science
    • Research Center for Materials Nanoarchitectonics
    • Research Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • National Institute for Materials Sciences
    • NIMS
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Material Science
    • International Center for Materials Nanoarchitectonics, NIMS, Japan
    • International Center for Materials Nanoarchitectonics, Tsukuba
    • National Institue for Materials Science
    • Kyoto University
    • National Institute of Materials Science
    • International Center for Materials Nanoarchitectonics and National Institute for Materials Science

  • Terry P Orlando

    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology

  • Simon Gustavsson

    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology

  • Jeffrey A Grover

    • Massachusetts Institute of Technology
    • Massachusetts Institute of Technology (MIT)
    • Massachusetts Institute of Technology MIT

  • Kyle Serniak

    • MIT Lincoln Laboratory & MIT RLE
    • MIT Lincoln Laboratory
    • MIT Lincoln Laboratory, MIT RLE

  • Pablo Jarillo-Herrero

    • Massachusetts Institute of Technology MI
    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology

  • Pablo Jarillo-Herrero

    • Massachusetts Institute of Technology MI
    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology

  • William D Oliver

    • Massachusetts Institute of Technology MI
    • Massachusetts Institute of Technology
    • Massachusetts Institute of Technology (MIT)
    • Massachusetts Institute of Technology MIT