APS Logo

Imaging moiré superlattices in twisted bilayers of 2D materials

ORAL

Abstract

Two-dimensional materials stacked into van der Waals (vdW) heterostructures form moiré superlattices as a result of a relative rotational misalignment between layers as well as a lattice mismatch between two dissimilar materials. The resulting physics of the vdW heterostructures can be dominated by the large scale periodicity of the moiré superlattice which is generally substantially larger than the atomic scale lattice. In this work we outline a method to visualize the real-space moiré superlattices in a variety of twisted vdW heterostructures utilizing piezoresponse force microscopy which locally measures an electromechanical sample surface deformation. Its origin is suggested to arise due to the flexoelectric effect wherein electric polarization is induced through strain gradients present within moiré superlattices.

–

Presenters

  • Leo McGilly

    Columbia University, Physics, Columbia University

Authors

  • Leo McGilly

    Columbia University, Physics, Columbia University

  • Alexander Kerelsky

    Columbia University, Physics, Columbia University, Physics Department, Columbia University

  • Nate Finney

    Columbia University

  • Kostantin Shapovalov

    Institute of Materials Science of Barcelona

  • Augusto Ghiotto

    Columbia University, Columbia Univ, Physics, Columbia University, Department of Physics, Columbia University

  • En-Min Shih

    Columbia University, Columbia Univ, Physics, Columbia University

  • Yihang Zeng

    Columbia University, Columbia Univ, Department of Physics, Columbia University

  • Samuel Moore

    Columbia University, Physics, Columbia University

  • Wenjing Wu

    Columbia University, Department of Chemistry, Columbia University

  • Yusong Bai

    Columbia University, Columbia Univ, Chemistry, Columbia University, Columbia University, Chemistry

  • Lin Zhou

    Nanjing University, Department of Chemistry, Columbia University

  • Kenji Watanabe

    National Institute for Materials Science, Japan, National Institute for Material Science, National Institute for Materials Science, National Institute for Materials Science, Tsukuba, Research Center for Functional Materials, NIMS, nims, Advanced Materials Laboratory, National Institute for Materials Science, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, NIMS, National Institute for Material Science - Japan, NIMS Tsukuba, National Institute for Materials Science, Namiki 1-1, Ibaraki 305-0044, Japan., National Institute for Materials Science (NIMS), National Institute for Materials Science,Tsukuba, Ibaraki 305-0047, Japan, Advanced Materials Laboratory, NIMS, Japan, National Institute for Materials Science,1-1 Namiki, Tsukuba, 305-0044, Japan, National Institute of Materials Science, National Institute for Materials Science, University of Tsukuba, National Institute for Materials Science, Tsukuba, Japan, National Institute for Material Science, Japan, National Institue for Material Science, Tsukuba, Advanced Materials Laboratory, NIMS, Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba 305-0044, Japan, Advanced Matrials Lab, NIMS, National Institute for Material Science, Tsukuba, Japan, National institute for materials science, NIMS-Tsukuba, NIMS, Japan, National Institute for Materials Science, Namiki Tsukuba Ibaraki, Japan, NIRM, Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, Japan, NIMS Japan, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan, Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki, Japan, Advanced Materials Laboratory, National Institute of Materials Science, Advanced Materials Laboratory, National Institute for Materials Science 1-1 Namiki, Tsukuba, 305-0044, Japan, National Institute of Material Science, 1-1 Namiki, Tsukuba 305-0044, Japan, National Institute for Material Science (Japan), Physics, NIMS, National Institute of Materials Science, Japan, National Institute of Materials Science (NIMS), National Institute of Materials Science, Tsukuba, Ibaraki 305-0044, Japan, NIMS - Tsukuba

  • Takashi Taniguchi

    National Institute for Materials Science, Japan, National Institute for Material Science, National Institute for Materials Science, National Institute for Materials Science, Tsukuba, Research Center for Functional Materials, NIMS, nims, Advanced Materials Laboratory, National Institute for Materials Science, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, NIMS, National Institute for Material Science - Japan, NIMS Tsukuba, National Institute for Materials Science, Namiki 1-1, Ibaraki 305-0044, Japan., National Institute for Materials Science (NIMS), National Institute for Materials Science,Tsukuba, Ibaraki 305-0047, Japan, Advanced Materials Laboratory, NIMS, Japan, National Institute for Materials Science,1-1 Namiki, Tsukuba, 305-0044, Japan, National Institute of Materials Science, National Institute for Materials Science, University of Tsukuba, National Institute for Materials Science, Tsukuba, Japan, National Institue for Material Science, Tsukuba, Advanced Materials Laboratory, NIMS, Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba 305-0044, Japan, Advanced Matrials Lab, NIMS, National Institute for Material Science, Tsukuba, Japan, National institute for materials science, NIMS-Tsukuba, NIMS, Japan, National Institute for Materials Science, Namiki Tsukuba Ibaraki, Japan, Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, Japan, NIMS Japan, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan, Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki, Japan, Advanced Materials Laboratory, National Institute of Materials Science, Advanced Materials Laboratory, National Institute for Materials Science 1-1 Namiki, Tsukuba, 305-0044, Japan, National Institute of Material Science, 1-1 Namiki, Tsukuba 305-0044, Japan, National Institute for Material Science (Japan), Physics, NIMS, National Institute of Materials Science, Japan, National Institute of Materials Science, Tsukuba, Ibaraki 305-0044, Japan, NIMS - Tsukuba

  • James C Hone

    Columbia University, Mechanical Engineering, Columbia University, Columbia Univ, Physics, Columbia University, Columbia University, NY, USA, Department of Mechanical Engineering, Columbia University

  • Xiaoyang Zhu

    Columbia University

  • Dmitri Basov

    Columbia University, The Department of Physics, Columbia University, Physics, Columbia University, Columbia Univ, Department of Physics, Columbia University

  • Cory Dean

    Department of Physics, Columbia University, Columbia University, Columbia Univ, Physics, Columbia University

  • Cyrus Dreyer

    Columbia University, Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York, 11794-3800, USA and Center for Computational Quantum Physics, Flatiron Institute, 162 5th, Department of Physics and Astronomy, Stony Brook University, State Univ of NY - Stony Brook, Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York, 11794-3800, USA, and Center for Computational Quantum Physics, Flatiron Institute, 162 5th

  • Abhay Pasupathy

    Columbia University, Physics Department, Columbia University, Columbia Univ, Department of Physics, Columbia University, New York, New York 10027, USA, Physics, Columbia University, Department of Physics, Columbia University