Quantum criticality in an artificial moire Kondo lattice

ORAL

Abstract

We artificially construct a two-dimensional Kondo lattice by combining transition metal dichalcogenide (TMD) moire superlattices with an angle-misaligned monolayer. At half band filling of the moire lattice, strong on-site Coulomb repulsion localizes electrons to form a triangular lattice, which provides local spin moments for the Kondo lattice. Angle-misaligned TMD monolayer hosts itinerate electrons coupled with the local moment layer via spin-exchange interaction. We demonstrate typical Kondo characteristics in this artificial system, including heavy fermion behaviors and a sudden change in the size of the Fermi surface during the Kondo breakdown. By tuning the density of local moments, we observe a quantum phase transition between heavy fermions and orbital-selective Mott states. Our study provides a highly tunable Kondo lattice system for discovery of rich exotic states in the Kondo phase diagrams and a better understanding of Kondo-related physics.

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Presenters

  • Zhongdong Han

    • Cornell University

Authors

  • Zhongdong Han

    • Cornell University

  • Yiyu Xia

    • Cornell University

  • 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

  • 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

  • Jie Shan

    • Cornell University

  • Kin Fai Mak

    • Cornell University