Strange metal behavior of the Hall angle in twisted bilayer graphene

ORAL

Abstract

Twisted bilayer graphene (TBG) has emerged as a tunable system exhibiting a number of correlated phases including Mott-like insulators, superconductivity, and magnetism. A linear in temperature normal state resistivity has been attributed to an exotic Planckian dissipation[1] mechanism but can be equally well explained in terms of conventional electron-phonon scattering [2, 3]. Here we discuss combined temperature-dependent transport measurements of both the longitudinal and Hall resistivities in close to magic-angle TBG. While the longitudinal resistivity is consistent with previous reports [1, 2], the Hall resistance shows an anomalous T dependence, providing new insight and a cotangent of the Hall angle cot(ΘH)∝T2. Boltzmann theory for quasiparticle transport predicts that both the resistivity and cot(ΘH) should have the same T dependence, contradicting the observed behavior. This provides strong evidence that TBG is incompatible with ordinary quasiparticle transport, reminiscent of other correlated strange metals such as cuprates.
[1] Y. Cao, et al. PhysRevLett.124.076801(2020)
[2] H. Polshyn, et al. Nat. Phys.15, 1011-1016(2019)
[3] J. A. N. Bruin, et al. Science 339, 804-807(2013)

*The experimental work was funded by the Department of Energy under award DE-SC0020187.

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Presenters

  • Zachary Tuchfeld

    • Physics, Ohio State Univ - Columbus

Authors

  • Zachary Tuchfeld

    • Physics, Ohio State Univ - Columbus

  • Rui Lyu

    • Physics, Ohio State Univ - Columbus

  • Nishchhal Verma

    • Physics, Ohio State Univ - Columbus
    • Ohio State Univ - Columbus

  • Haidong Tian

    • Ohio State Univ - Columbus
    • Physics, Ohio State Univ - Columbus

  • 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, Japan
    • National Institute for Materials Science
    • Department of Chemical Engineering, Kyoto University
    • National Institute for Materials Science, Tsukuba, Ibaraki, Japan
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • Materials, NIMS
    • International Center for Materials Anorthite, National Institute for Materials Science, Ibaraki, Japan
    • Kyoto University

  • Jeanie Lau

    • Physics, Ohio State Univ - Columbus

  • Mohit Randeria

    • Deparment of Physics, The Ohio State University
    • Physics, Ohio State Univ - Columbus
    • Ohio State Univ - Columbus

  • Marc Bockrath

    • Deparment of Physics, The Ohio State University
    • Ohio State Univ - Columbus
    • Physics, Ohio State Univ - Columbus