Zero-field superconducting diode effect in twisted trilayer graphene

ORAL  · Invited

Abstract

A zero-field superconducting diode effect is recently reported in twisted trilayer graphene, evidenced by the highly nonreciprocal I-V curve and directional dependence in the critical supercurrent [1]. This phenomenon points towards an electronic order in graphene moir'e systems that breaks both parity and time-reversal symmetry (PT-breaking). In this talk, I use a scheme of angle-resolved nonreciprocal transport response to identify the PT-breaking order in twisted trilayer graphene. By analyzing the evolution with varying magnetic field, moir'e band filling and current bias, I show that this PT-breaking order is distinct from orbital ferromagnetism. While the zero-field superconducting diode effect is observed over a wide range of twist angles, it is the most prominent when the twist angle is detuned from the magic-angle regime. To understand this unique twist angle dependence, I will discuss the subtle interplay between the moir'e flatband and Coulomb interaction, which gives rise to a new cascade order in the small twist angle regime.

[1] Jiang-Xiazi Lin, et al. "Zero-field superconducting diode effect in small-twist-angle trilayer graphene." Nature Physics 18, 10 (2022)

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Publication: Jiang-Xiazi Lin, et al. "Zero-field superconducting diode effect in small-twist-angle trilayer graphene." Nature Physics 18, 10 (2022)

Presenters

  • Jiang-Xiazi Lin

    • Brown University

Authors

  • Jiang-Xiazi Lin

    • Brown University

  • Jia Li

    • Brown University

  • Phum Siriviboon

    • Brown University

  • Harley D Scammell

    • University of New South Wales

  • Mathias S Scheurer

    • Univ of Innsbruck
    • University of Innsbruck

  • Naiyuan J Zhang

    • Brown University

  • Song Liu

    • Columbia University

  • Daniel Rhodes

    • University of Wisconsin - Madison

  • James C Hone

    • Columbia University

  • Takashi Taniguchi

    • National Institute for Materials Science
    • Kyoto Univ
    • International Center for Materials Nanoarchitectonics, National Institute of Materials Science
    • Kyoto University
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • National Institute For Materials Science
    • NIMS
    • National Institute for Material Science
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Japan
    • NIMS Japan

  • Kenji Watanabe

    • National Institute for Materials Science
    • Research Center for Functional Materials, National Institute of Materials Science
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan
    • NIMS
    • Research Center for Functional Materials, National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Japan
    • NIMS Japan