APS Logo

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)

–

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