Atomic-scale structure and electronic properties of twisted double bilayer graphene: topological edge states and broken symmetries

ORAL

Abstract

Van der Waals materials stacked with an interlayer twist are an excellent platform towards achieving gate-tunable correlated phenomena linked to the formation of flat bands. We demonstrate the formation of correlated phases in twisted double bilayer graphene (tDBG) in two regimes of twist angle: minimally twisted (<0.1°) and 1.1°. Tiny-angle tDBG host large regions of uniform rhombohedral graphene where scanning tunneling spectroscopy reveals a sharp flat band of 3-5 meV half-width. We demonstrate that, when this flat band straddles the Fermi level, a correlated many-body gap emerges. Moreover, we show that ABCA graphene hosts surface topological edge states at natural interfaces with ABAB graphene. Scanning tunneling microscopy on tDBG at higher twist (~1.1°) reveals the presence of van Hove singularities on all inequivalent moiré sites. Tuning carrier density and displacement field reveals long-range broken C3 symmetry that emerge when the Fermi level is at the electronic flat bands. We demonstrate that the C3 symmetry breaking is a manifestation of an interaction-driven electronic nematic phase, which emerges even away from integer fillings. The nematic instability is an emergent phenomenon at the scale of the moiré lattice, pointing to its universal character.

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Presenters

  • Carmen Rubio Verdú

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

Authors

  • Carmen Rubio Verdú

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

  • Alexander Kerelsky

    • Columbia University

  • Simon Turkel

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

  • Larry Song

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

  • Lennart Klebl

    • RWTH Aachen University
    • Institute for Theory of Statistical Physics, RWTH Aachen University, and JARA Fundamentals of Future Information Technology, 52062 Aachen, Germany
    • Institute for Theory of Statistical Physics, Aachen University
    • RWTH Aachen
    • Institute for Theory of Statistical Physics, RWTH Aachen University

  • Rhine Samajdar

    • Harvard University
    • Department of Physics, Harvard University, Cambridge, MA 02138, USA

  • Mathias Scheurer

    • Universitat Innsbruck
    • Harvard University
    • University of Innsbruck
    • Department of Physics, Harvard University, Cambridge, MA 02138, USA

  • Jorn W. F. Venderbos

    • Department of Physics, Drexel University, Philadelphia, PA 19104, USA
    • Drexel University
    • Department of Physics, Department of Materials Science and Engineering, Drexel University

  • Lei Wang

    • Physics, Nanjing University
    • Columbia University
    • Physics, Columbia University
    • Cornell University

  • Dorri Halbertal

    • Columbia University
    • Columbia Univ
    • Physics, Columbia University

  • Nathan R Finney

    • Columbia University

  • Kenji Watanabe

    • National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • National Institure for Materials Science
    • Advanced Materials Laboratory, National Institute for Materials Science
    • NIMS
    • National Institute of Materials Science
    • National Institute for Materials Science (NIMS)
    • Research Center for Functional Materials, National Institute for Materials Science
    • National Institute for Materials Science,1-1 Namiki
    • National Institute of Material Science
    • National Institute for Materials Science, Tsukuba, Japan
    • Research Center for Functional Materials, NIMS
    • National Institute of Materials Science, Tsukuba, Japan
    • National Institude for Materials Science
    • National Institute for Materials Science, Tsukuba, Ibaraki, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, Tsukuba 305-0044, Japan
    • International Center for Materials Nanoarchitectonics, National Institute for Materials
    • NIMS - Japan
    • National Institute for Materials Science ,Japan
    • National Institute for Materials Science, Tsukuba, 305-0044, Ibaraki, Japan
    • National Institute for Material Science
    • National Institute for Material Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Material Science Japan
    • NIMS Tsukuba
    • National Institute for Materials Science, Research Center for Functional Materials, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Materials Science: Namiki, Tsukuba, Ibaraki, JP
    • National Institue for Material Science
    • National Institute for Materials Science,1-1 Namiki, Tsukuba, 305-0044, Japan
    • Materials, NIMS
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, Research Center for Functional Materials, National In
    • Research Center for Functional Materials, Japan
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • International Center for Materials nanoarchtectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan
    • NIMS Suguba
    • NIMS, Tsukuba, Japan
    • National Institute for Materials Science, Namiki 1-1, Tsukuba, 305-0044, Ibaraki, Japan
    • National institute of material science
    • Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan
    • Advanced Materials Laboratory, NIMS
    • Research Center for Functional Materials, National Institute for Materials Science, Ibaraki, Japan
    • National Institute for Materials Science, Research Center for Functional Materials
    • National Institute of Material Science, Japan
    • Tsukuba, National Institute for Materials Science

  • Takashi Taniguchi

    • National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • National Institure for Materials Science
    • Advanced Materials Laboratory, National Institute for Materials Science
    • NIMS
    • National Institute of Materials Science
    • National Institute for Materials Science (NIMS)
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • National Institute for Materials Science,1-1 Namiki
    • National Institute of Material Science
    • National Institute for Materials Science, Tsukuba, Japan
    • International Center for Materials Nanoarchitectonics, NIMS
    • Research Center for Functional Materials, National Institute for Materials Science
    • National Institute of Materials Science, Tsukuba, Japan
    • National Institude for Materials Science
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba 305-0044, Japan
    • International Center for Materials Nanoarchitectonics, National Institute for Materials
    • NIMS - Japan
    • National Institute for Materials Science ,Japan
    • National Institute for Materials Science, Tsukuba, 305-0044, Ibaraki, Japan
    • National Institute for Material Science
    • National Institute for Material Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Material Science Japan
    • 8International Center for Materials Nanoarchitectonics
    • NIMS Tsukuba
    • National Institute for Materials Science: Namiki, Tsukuba, Ibaraki, JP
    • National Institue for Material Science
    • National Institute for Materials Science,1-1 Namiki, Tsukuba, 305-0044, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, Research Center for Functional Materials, National In
    • Research Center for Functional Materials, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan
    • International Center for Material Nanoarchitectonics, National Institute for Materials Science
    • International Center for Materials Nanoarchitectonics
    • NIMS Suguba
    • NIMS, Tsukuba, Japan
    • National Cheng Kung University
    • National Institute for Materials Science, Namiki 1-1, Tsukuba, 305-0044, Ibaraki, Japan
    • National institute of material science
    • Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan
    • Advanced Materials Laboratory, NIMS
    • National Institute for Materials Science, International Center for Materials Nanoarchitectonics
    • National Institute of Material Science, Japan
    • Tsukuba, National Institute for Materials Science

  • Hector Ochoa

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

  • Lede Xian

    • Max Planck Institute for the Structure and Dynamics of Matter
    • Theory, Max Planck Institute for the Structure and Dynamics of Matter
    • Physics, Max Planck Institute
    • Max Planck Institute for Structure and Dynamics of Matter and Center for Free-Electron Laser Science
    • Max Planck Institute for the Structure and Dynamics of Matter, Center for Free Electron Laser Science, 22761 Hamburg, Germany
    • Songshan Lake Materials Laboratory
    • Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany

  • Dante Kennes

    • Institut fur Theorie der Statistischen Physik, RWTH Aachen
    • RWTH Aachen University
    • Institut für Theorie der Statistischen Physik, RWTH Aachen University
    • Institute for Theory of Statistical Physics, Aachen University
    • RWTH Aachen
    • Aachen
    • Institute for Theory of Statistical Physics, RWTH Aachen University

  • James Hone

    • Columbia Univ
    • Columbia University
    • Department of Mechanical Engineering, Columbia University
    • Mechanical Engineering, Columbia University

  • Cory Dean

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

  • Dmitri Basov

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

  • Rafael Fernandes

    • University of Minnesota
    • School of Physics and Astronomy, University of Minnesota
    • Physics, University of Minnesota
    • School of Physics and Astronomy, University of Minnesota, Minneapolis, 55455 MN
    • School of Physics and Astronomy, University of Minnesota, Minneapolis

  • Angel Rubio

    • Max Plank Institute for the Structure and Dynamics of Matter; Center for Computational Quantum Physics Flatiron Institute
    • Max Planck Institute for the Structure and Dynamics of Matter
    • Theory, Max Planck Institute for the Structure and Dynamics of Matter
    • Max Planck Inst Structure & Dynamics of Matter
    • Physics, Max Planck Institute
    • Max Planck Institute for Structure and Dynamics of Matter and Center for Free-Electron Laser Science
    • Max Planck Institute for the Structure and Dynamics of Matter, Center for Free Electron Laser Science, 22761 Hamburg, Germany
    • Max Planck Institute for the Structure and Dynamics of Matter and Center Free-Electron Laser Science, Hamburg, Germany
    • Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany
    • MPSD Hamburg
    • Max Planck Institute
    • Max Planck Inst Structure & Dynamics of Matter; Center for Computational Quantum Physics Flatiron Institute, Simons Foundation NY, USA
    • Theory, Max Planck Inst Structure & Dynamics of Matter

  • Abhay Narayan

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