Strong correlations and isospin symmetry breaking in a supermoiré lattice

ORAL

Abstract

In multilayer moiré heterostructures, the interference of multiple twist angles ubiquitously leads to tunable ultra-long-wavelength patterns known as supermoiré lattices. However, their impact on the system's many-body electronic phase diagram remains unknown. In this talk, we present local compressibility measurements of twisted trilayer graphene revealing numerous incompressible states resulting from supermoiré-lattice-scale isospin symmetry breaking driven by strong interactions. By using the supermoiré lattice occupancy as a probe of isospin symmetry, we observe an unexpected doubling of the miniband filling near ν=−2, possibly indicating a hidden phase transition or normal-state pairing proximal to the superconducting phase. Our work establishes supermoiré lattices as a tunable parameter for designing novel quantum phases and an effective tool for unraveling correlated phenomena in moiré materials.

*This work was supproted by Army Research Office, Gordon and Betty Moore Foundation, National Science Foundation and Harvard Quantum Initiative in Science and Engineering.

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Presenters

  • Yonglong Xie

    • Rice University

Authors

  • Yonglong Xie

    • Rice University

  • Andrew T Pierce

    • Harvard University

  • Jeong Min Park

    • Massachusetts Institute of Technology

  • Daniel E Parker

    • University of California at San Diego
    • Harvard University

  • Jie Wang

    • Harvard University

  • Patrick Ledwith

    • Harvard University
    • Harvard university

  • Zhuozhen Cai

    • Harvard University

  • 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

  • Eslam Khalaf

    • University of Texas at Austin
    • Harvard University

  • Ashvin Vishwanath

    • Harvard University

  • Pablo Jarillo-Herrero

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

  • Amir Yacoby

    • Harvard University