Strong signature of Landau level fan from high order moiré pattern in double aligned graphene heterostructures

POSTER

Abstract

The moiré pattern in graphene heterostructures provides a great opportunity to study the energy spectrum of moving charge carriers in both a periodic potential and a magnetic field, the famous Hofstadter energy spectrum. Because of the suitable length scale of the periodic potential induced by the moiré pattern, it become possible to use laboratory accessible magnetic field to measure the Hofstadter energy spectrum. However, as the maximum periodicity of the moiré pattern in graphene heterostructures is approximately 14 nm, so far the measurable Hofstadter energy spectrum is limited to the first Bloch band. In this work, we report the transport measurement of double aligned graphene heterostructures. We observe strong signature of Landau level fan of a second order moiré pattern due to the interference of the moiré patterns from top and bottom graphene surfaces. The periodicity of the second order moiré pattern is about double the maximum periodicity of moiré patterns in graphene heterostructures. Our work indicates the second order moiré pattern in graphene heterostructures may make it possible to measure the high Bloch bands in Hofstadter energy spectrum.

*This research was partially supported by the Australian Research Council Centre of Excellence in Future Low-Energy Electronics Technologies (Project No. CE170100039) and funded by the Australian government. This work was performed in part using facilities of the NSW Nodes of the Australian National Fabrication Facility.

Presenters

  • Feixiang Xiang

    • The University of New South Wales

Authors

  • Feixiang Xiang

    • The University of New South Wales

  • Abhay Gupta

    • The University of New South Wales
    • University of New South Wales

  • Andrey Chaves

    • Universidade Federal do Ceara
    • Universidade Federal do Ceará

  • Kenji Watanabe

    • National Institute for Materials Science
    • Research Center for Functional Materials, National Institute of Materials Science
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan
    • NIMS
    • Research Center for Functional Materials, National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Japan
    • NIMS Japan

  • Takashi Taniguchi

    • National Institute for Materials Science
    • Kyoto Univ
    • International Center for Materials Nanoarchitectonics, National Institute of Materials Science
    • Kyoto University
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • National Institute For Materials Science
    • NIMS
    • National Institute for Material Science
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Japan
    • NIMS Japan

  • David Neilson

    • University of Antwerp

  • Francois M Peeters

    • University of Antwerp
    • Univ of Antwerp

  • Milorad V Milosevic

    • University of Antwerp
    • ANO lab Center of Excellence. Department of Physics, Faculty of Science, University of Antwerp, Belgium

  • Alexander R Hamilton

    • University of New South Wales