Edge state structure of the bilayer graphene zero Landau level

ORAL

Abstract

In the eight-fold degenerate zero-energy Landau level (ZLL). Bernal stacked bilayer graphene exhibits numerous phase transitions between gapped states with different spin, valley, and orbital polarization. I will describe combined transport and capacitance measurements in dual graphite-gated devices performed in tilted magnetic fields. In addition to a quantum spin Hall state at zero density, we find evidence for protected, counter-propagating edge states near half filling of the ZLL. I will discuss these results with different models for symmetry breaking within the ZLL.

–

Authors

  • Haoxin Zhou

    Department of Physics, University of California, Santa Barbara, California 93106-6105 USA

  • Alexander Zibrov

    Department of Physics, University of California, Santa Barbara, California 93106-6105 USA

  • Eric Spanton

    California NanoSystems Institute, University of California Santa Barbara, CA 93106-6105

  • Takashi Taniguchi

    Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan, National Institute for Materials Science

  • Kenji Watanabe

    Japanese National Institute of Materials Science, Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan, National Institute for Materials Science

  • Andrea Young

    Department of Physics, University of California, Santa Barbara CA 93106, Department of Physics, University of California, Santa Barbara CA 93106 USA