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Progress in quantum transport study of magic-angle twisted bilayer/bilayer graphene

POSTER

Abstract

Magic-angle twisted bilayer/bilayer graphene (TBBG) has shown various kinds of correlated electronic phases including superconductivity, ferromagnetism, Mott insulator [1, 2]. First, we discuss our dry transfer technique for making atomically clean TBBG with so-called tear-and-stack process. In our experiment, we measured the electron-electron interaction induced Mott insulating state at half fillings. We also observed the signature of superconducting phase near Mott insulating phase, and investigated by measuring temperature dependence and magnetic field dependence of current-voltage characteristics. As twist angle uniformity is crucial to form a macroscopic superconducting phase [3], we discuss our efforts and progress in realizing more homogeneous twist angle in TBBG devices.

REFERENCES:
[1] Cao, Y., et al. (2018). "Unconventional superconductivity in magic-angle graphene superlattices." Nature 556(7699): 43-50.
[2] Xiaomeng Liu, et al. (2019). "Spin-polarized Correlated Insulator and Superconductor in Twisted Double Bilayer Graphene." arXiv:1903.08130
[3] Xiaobo Lu, et al. (2019). “Superconductors, Orbital Magnets, and Correlated States in Magic Angle Bilayer Graphene.” arXiv:1903.06515

Presenters

  • Hyeon-Woo Jeong

    Pohang Univ of Sci & Tech

Authors

  • Hyeon-Woo Jeong

    Pohang Univ of Sci & Tech

  • Jinho Park

    Pohang Univ of Sci & Tech, Department of Physics, POSTECH, Pohang, Republic Korea

  • Su-Beom Song

    Pohang Univ of Sci & Tech, Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, Republic of Korea

  • Jonghwan Kim

    Pohang Univ of Sci & Tech, Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, Republic of Korea

  • 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

  • Gil-Ho Lee

    Pohang University of Science and Technology, Pohang Univ of Sci & Tech, Department of Physics, POSTECH, Pohang, Republic Korea