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