Imaging double- moiré pattern in twisted bilayer graphene aligned on <i>h</i>-BN substrate

ORAL

Abstract

Moiré superlattices in van der Waals heterostructures have been a promising platform to explore emergent electronic phenomena. Here, we report the imaging experiment of a double moiré pattern in twisted bilayer-graphene that is aligned on h-BN substrate, using microwave impedance microscopy. Two graphene layers are directly grown on h-BN flakes using CVD method. The first layer grows directly on the h-BN substrate with a 0-degree alignment, while the second layer grows on top of the first one at a small twist angle. We resolve two sets of moiré patterns formed in this tri-layer heterostructure, a larger one (~15 nm) between the first graphene and h-BN and a smaller one between the two graphene layers.The smaller moiré pattern exhibits abrupt discontinuities at the boundaries of the larger moiré pattern. We analyze the parameters of the two moiré superlattices based on both a simple trilayer stacking model and FFT calculation, which agrees well with our experimental observations.

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Presenters

  • Xiong Huang

    • University of California, Riverside
    • Department of Physics and Astronomy, University of California, Riverside
    • University of California, Reverside

Authors

  • Xiong Huang

    • University of California, Riverside
    • Department of Physics and Astronomy, University of California, Riverside
    • University of California, Reverside

  • Lingxiu Chen

    • Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences

  • Shujie Tang

    • Stanford University

  • Chengxin Jiang

    • Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences

  • chen Chen

    • Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences

  • Huishan Wang

    • Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences

  • Zhixun Shen

    • Stanford University
    • Stanford Univ
    • Stanford Institute for Materials and Energy Sciences, SLAC - Natl Accelerator Lab
    • Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory

  • Haoming Wang

    • Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences

  • Yongtao Cui

    • University of California, Riverside
    • Department of Physics and Astronomy, University of California, Riverside
    • University of California, Reverside