Trigonal warping and even denominator fractional quantum Hall effect in trilayer graphene

ORAL

Abstract

We report magneto-capacitance measurements of high quality trilayer graphene devices fabricated by encapsulating the trilayer in both boron nitride and few-layer-thick graphite. The resulting devices are exceptionally low-disorder. We resolve Landau levels at magnetic fields well below 1 T and odd-denominator fractional quantum Hall (FQH) states at B = 6 T. At high displacement fields and low magnetic fields, we observe the emergence of three-fold quasi-degenerate Landau levels, signifying the emergence of new massless Dirac points. At high magnetic fields, we observe numerous fractional quantum Hall states between filling factors ν = -6 and +6. In addition to the expected hierarchy of odd-denominator states, we also observe even denominator states at ν =9/2 (at B = 30 T) and 9/2 and 11/2 (at B = 40 T).

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Presenters

  • Carlos Kometter

    Department of Physics, University of California, Santa Barbara, Physics Department, University of California

Authors

  • Carlos Kometter

    Department of Physics, University of California, Santa Barbara, Physics Department, University of California

  • Alexander Zibrov

    University of California - Santa Barbara, Department of Physics, University of California, Santa Barbara, Physics Department, University of California, Univ of California - Santa Barbara

  • Eric Spanton

    University of California - Santa Barbara, Stanford Univ, California Nanosystems Institute, University of California, Santa Barbara, California Nanosystems Institute, University of California, Univ of California - Santa Barbara

  • Jia Li

    Columbia Univ, Columbia University, physics, columbia university in the city of new york, Department of Physics, Columbia University

  • Takashi Taniguchi

    National Institute for Materials Science, NIMS, Advanced Materials Laboratory, National Institute for Materials Science, Chemical Engineering, Kyoto Univ, Advanced materials laboratory, National institute for Materials Science

  • Kenji Watanabe

    National Institute for Materials Science, NIMS, National Institute for Material Science, Advanced Materials Laboratory, National Institute for Materials Science, National Institute of Materials Science, Research Center for Functional Materials, National Institute for Materials Science, National Institute for Materials Science (NIMS, Advanced Materials Laboratory, NIMS, National Institute for Materials Science, Advanced Materials Laboratory, National Institue for Materials Science, National Institute of Material Science, National Institute for Matericals Science, Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Advanced materials laboratory, National institute for Materials Science, NIMS-Japan

  • Maksym Serbyn

    Institute of Science and Technology

  • Andrea Young

    Physics, University of California Santa Barbara, Physics, Univ of California - Santa Barbara, University of California - Santa Barbara, Univ of California - Santa Barbara, Department of Physics, University of California, Santa Barbara, Physics Department, University of California