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