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Theoretical modelling on new level crossings and electron-hole asymmetry in Landau octet of bilayer graphene

POSTER

Abstract

The highly tunable band structure and eightfold degeneracy of the zero-energy Landau level (zLL) of bilayer graphene (BLG) make it an ideal platform for engineering new quantum Hall states, denoted by the orbital, valley, and spin quantum numbers. However, determining the orbital, valley, and spin order of quantum Hall states at different filling factors and electric fields is still an unresolved question. In the experiments, we observe new zero-energy Landau level crossings at filling factor -2, 1 and 3 in high electric fields at millikelvin temperatures. These observations enable us to constrain the parameters for constructing a simplified effective single-particle theoretical model, which can be used to fully determine the quantum Hall states. The model predicts the importance of coulomb interactions in this system via exchange-enhanced Zeeman g-factor.

Presenters

  • Abhay Gupta

    The University of New South Wales, University of New South Wales

Authors

  • Abhay Gupta

    The University of New South Wales, University of New South Wales

  • Feixiang Xiang

    The 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