Signatures of tunable magnetic-field-induced superconductivity and their large Pauli violation in hexalayer rhombohedral graphene

ORAL

Abstract

Rhombohedral multilayer graphene systems have emerged as a unique platform to host multiple unconventional superconducting behaviors. Here, we report signatures of in-plane magnetic fields induced superconductivity in hexalayer rhombohedral graphene near a symmetry-breaking transition. The onset and critical magnetic field for the field-induced superconductivity can be continuously tuned by electric fields with a critical magnetic field maxima > 14 T which is far beyond the Pauli limit. Fermiology analysis reveals that these superconducting states derived from the Lifshitz transition at the symmetry breaking phase boundary. The experimental results suggest a highly unconventional superconductivity behavior in hexalayer rhombohedral graphene that possibly possesses a spin-triplet order parameter.

*X. L. acknowledges support from the National Science Foundation through the CAREER program under Award No. DMR-2442363. J. D. acknowledges support from the New Frontier Grant, College of Arts & Sciences, Cornell University. The device fabrication is performed in part in Cornell Center for Materials Research and in part at the Cornell NanoScale Facility, a member of the National Nanotechnology Coordinated Infrastructure (NNCI), which is supported by the National Science Foundation (Grant NNCI-2025233). K.W. and T.T. acknowledge support from the JSPS KAKENHI (Grant Numbers 21H05233 and 23H02052), the CREST (JPMJCR24A5), JST and World Premier International Research Center Initiative (WPI), MEXT, Japan.

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Presenters

  • Jiabin Xie

    • Lab of Atomic and Solid State Physics, Cornell
    • Cornell University

Authors

  • Jiabin Xie

    • Lab of Atomic and Solid State Physics, Cornell
    • Cornell University

  • Jinghao Deng

    • Lab of Atomic and Solid State Physics, Cornell
    • Lab of Atomic and Solid State Physics, Cornell University

  • Hongyuan Li

    • Lab of Atomic and Solid State Physics, Cornell
    • Cornell University

  • Takashi Taniguchi

    • National Institute for Materials Science
    • Research Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • International Center for Materials Nanoarchitectonics, National Institute of Materials Science, 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan
    • Research Center for Functional Materials, National Institute of Materials Science, 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan

  • Kenji Watanabe

    • National Institute for Materials Science
    • Research Center for Functional Materials, National Institute of Materials Science, 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan

  • Jie Shan

    • Cornell University

  • Kin Fai Mak

    • Cornell University

  • Xiaomeng Liu

    • Cornell University