Local electronic compressibility of magic angle twisted bilayer graphene

ORAL

Abstract

Twisted bilayer graphene near the magic angle (MATBG) exhibits remarkably rich electron correlation physics, displaying insulating, magnetic, and superconducting phases. In this talk, we probe the local electronic compressibility of MATBG using a scanning single electron transistor. We find that when carriers are added into this system, they repeatedly refill the same bands, leading to a Dirac-like compressibility cascade near integer moiré fillings. Additionally, we present a clear compressibility asymmetry around the center of the conduction and valence bands, reflecting the evolution from low DOS at charge neutrality to high DOS at the band edges. A mean-field theory that includes this asymmetry reproduces the experimental results, and explains previous observations that were not yet fully understood. This cascade of Dirac revivals should thus serve as the starting point for understanding the unusual behavior in this system.

*We acknowledge support from the Helmsley Charitable Trust grant, the ISF (grant no. 712539), Sagol Weizmann-MIT Bridge program, and the ERC-Cog (See-1D-Qmatter, no. 647413)

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Presenters

  • Asaf Rozen

    • Weizmann Institute of Science

Authors

  • Uri Zondiner

    • Weizmann Institute of Science

  • Asaf Rozen

    • Weizmann Institute of Science

  • Daniel Rodan

    • Massachusetts Inst of Tech-MIT

  • Yuan Cao

    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology, Cambridge, MA
    • Massachusetts Inst of Tech-MIT

  • Raquel Queiroz

    • Weizmann Institute of Science
    • Department of Condensed Matter Physics, Weizmann Institute of Science

  • Takashi Taniguchi

    • National Institute for Materials Science
    • National Institute for Material Science, Japan
    • National Institute of Material Science in Tsukuba
    • Kyoto Univ
    • Chemical Engineering, Kyoto University
    • Advanced Materials Laboratory, National Institute for Materials Science
    • National Institute of Materials Science (NIMS)
    • National Institute of Materials Science, Japan
    • Kyoto 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

  • Yuval Oreg

    • Weizmann Institute of Science

  • Felix von Oppen

    • Massachusetts Inst of Tech-MIT

  • Ady Stern

    • Weizmann Institute of Science
    • Department of Condensed Matter Physics, Weizmann Institute of Science

  • Erez Berg

    • Weizmann Institute of Science
    • Department of Physics, Weizmann Intitute of Science

  • Pablo Jarillo-Herrero

    • Massachusetts Institute of Technology
    • Massachusetts Institute of Technology MIT
    • Department of Physics, Massachusetts Institute of Technology (MIT)
    • Massachusetts Institute of Technology, Cambridge, MA
    • Massachusetts Inst of Tech-MIT

  • Shahal Ilani

    • Weizmann Institute of Science
    • Department of Condensed matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel