Transport measurement of twisted bilayer-bilayer graphene

ORAL

Abstract

The recent discovery of correlated insulator behavior and superconductivity in magic-angle graphene has attached tremendous interest in twisted van der Waals systems. So far, people have been focusing on the moiré superlattice and the flat band formed due to the interlayer coupling. In fact, twisting can be used to engineer the symmetry of a 2D system, which may lead to interesting phenomena that are not allowed in their natural form. In this work, we explore such broken symmetry effect in a twisted bilayer-bilayer graphene structure. The two bilayers are rotated with respect to each other by 180o. Based on the symmetry analysis, the twisted four-layer system is strongly inversion-broken and has an out-of-plane polar axis. We fabricated high quality dual-gated devices and we will report on the transport and optical behavior of this novel system.

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Presenters

  • Thao Dinh

    Massachusetts Institute of Technology

Authors

  • Thao Dinh

    Massachusetts Institute of Technology

  • Zhiren Zheng

    University of California, Berkeley, Massachusetts Institute of Technology, University of California at Berkeley

  • Qiong Ma

    Massachusetts Institute of Technology, Department of Physics, Massachusetts Institute of Technology

  • Suyang Xu

    Department of Physics, Massachusetts Institute of Technology, Massachusetts Institute of Technology, MIT, Physics, MIT, Department of Physics, Massachusetts Institute of Technology, Cambridge

  • Kenji Watanabe

    National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305 0044, Japan, Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, National Institute for Materials Science, Advanced Materials Laboratory, National Institute for Materials Science, , 1-1 Namiki, Tsukuba 305-0044, Japan, National Institute for Material Science, 1-1 Namiki, Tsukuba 305-0044, National Institute of Materials Science, NIMS, Japan, Advanced Materials Laboratory, NIMS, National Institute for Materials Science, Tsukuba, Japan, National Institute for Materials Science, Japan, Advanced Materials Laboratory, National Institute for Materials Science, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0044, Japan, National Institute for Materials Science (NIMS), NIMS Tsukuba, National Institute for Materials Science (Japan), NIMS, National Institute for Material Science, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Japan, National Institute for Materials Science , Japan, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan., Advanced Materials Laboratory, National Institute for Materials Science, Japan, Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan, National Institute for Materials Science, Tsukuba, Ibaraki 305- 0044, Japan, National Institute for Material Science - Japan, National Institute for Materials Science, Namiki Tsukuba Ibaraki, Japan, National Institute of Material Science, Advanced Material Lab, NIMS, Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, Japan, Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, Ibaraki, Japan, National Institute for Materials Science, Tsukuba, 1-1 Namiki, Tsukuba, National Institute for Materials Science, NIMS/Tsukuba, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044 Japan, National Institute for Materials Science, Namiki, 305-0044, Japan, National Institute for Material Science, Japan, Advanced Materials Laboratory, NIMS, Japan, Columbia University, Advanced Materials Labaratory, National Institute for Materials Science, National Institute of Material Science, 1-1 Namiki, Tsukuba, Ibaraki 205-0044, Japan, National Institute of Materials Science, Japan

  • Takashi Taniguchi

    Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, National Institute for Materials Science, Japan, National Institute for Materials Science (Japan), National Institute for Materials Science, NIMS, Kyoto University, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan., National Institute of Materials Science

  • Pablo Jarillo-Herrero

    Physics, Massachusetts Institute of Technology, Department of Physics, Massachusetts Institute of Technology, Massachusetts Institute of Technology, Dept. of Physics, Massachusetts Institute of Technology, USA, Massachusetts Inst of Tech-MIT, Physics, MIT

  • Nuh Gedik

    Physics, Massachusetts Institute of Technology, Massachusetts Inst of Tech-MIT, Massachusetts Institute of Technology, Department of Physics, Massachusetts Institute of Technology