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Spectroscopic features of the parent phase of magic-angle twisted bilayer graphene

ORAL

Abstract

Recent experiments on magic-angle twisted bilayer graphene (MATBG) have shown various intriguing low-temperature electronic phases induced by filling of the moiré flat bands [1][2]. These phases, including correlated insulator and superconducting phases, are derived from a high-temperature “parent phase,” which is currently not well understood. Previously, there have been scanning tunneling microscopy and spectroscopy (STM/STS) measurements of this parent phase that have shown signatures of strong electronic correlations [3]. In this talk, we report on new, higher resolution STM/STS studies of this phase. Our experimental results reveal new distinct filling-dependent spectroscopic features that reflect key information on the nature of many-body correlations in MATBG. We have found that these features can be compared to a model of strongly interacting electrons in the flat bands allowing us to determine the microscopic origin of these features as well as extract an estimate of the strength of electronic correlation in MATBG.

[1] Y. Cao et al. Nature 556, 43-50 (2018)
[2] M. Yankowitz et al. Science 363, 1059-1064 (2019)
[3] Y. Xie et al. Nature 572, 101-105 (2019)

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Presenters

  • Myungchul Oh

    Joseph Henry Laboratories & Department of Physics, Princeton University

Authors

  • Myungchul Oh

    Joseph Henry Laboratories & Department of Physics, Princeton University

  • Dillon Wong

    Joseph Henry Laboratories & Department of Physics, Princeton University

  • Kevin Nuckolls

    Joseph Henry Laboratories & Department of Physics, Princeton University

  • Biao Lian

    Princeton Center for Theoretical Science, Princeton University, Princeton University, Physics, Princeton University

  • Yonglong Xie

    Princeton University, Department of Physics, Harvard University, Harvard 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

  • Andrei Bernevig

    Physics, Princeton University, Princeton Center for Theoretical Science, Princeton University, Princeton University, Department of Physics, Princeton university, Physics department, Princeton University

  • Ali Yazdani

    Princeton University, Joseph Henry Laboratories & Department of Physics, Princeton University, Princeton Univ, Department of Physics, Princeton University