title: Tunable Symmetries of Integer and Fractional Quantum Hall Phases in Heterostructures with Multiple Dirac Bands.
abstract: The copresence of multiple Dirac bands in few-layer graphene leads to a rich phase diagram in the quantum Hall regime. Using transport measurements, we map the phase diagram of BN-encapsulated ABA-stacked trilayer graphene as a function charge density n, magnetic field B, and interlayer displacement field D, and observe transitions among states with different spin, valley, orbital, and parity polarizations. Such a rich pattern arises from crossings between Landau levels from different subbands, which reflect the evolving symmetries that are tunable in situ. At D=0, we observe fractional quantum Hall (FQH) states at filling factors 2/3 and -11/3. Unlike those in bilayer graphene, these FQH states are destabilized by a small interlayer potential that hybridizes the different Dirac bands.
authors: Department of Physics and Astronomy, University of California, Riverside, Riverside, California 92521, USA.
authors: Petr
authors: P
authors: Stepanov
authors: Department of Physics and Astronomy, University of California, Riverside, Riverside, California 92521, USA.
authors: Yafis
authors: Y
authors: Barlas
authors: Department of Physics and Astronomy, University of California, Riverside, Riverside, California 92521, USA.
authors: Tim
authors: T
authors: Espiritu
authors: Department of Physics and Astronomy, University of California, Riverside, Riverside, California 92521, USA.
authors: Shi
authors: S
authors: Che
authors: National Institute for Materials Science, 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan.
authors: Kenji
authors: K
authors: Watanabe
authors: National Institute for Materials Science, 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan.
authors: Takashi
authors: T
authors: Taniguchi
authors: National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA.
authors: Dmitry
authors: D
authors: Smirnov
authors: Department of Physics and Astronomy, University of California, Riverside, Riverside, California 92521, USA.
authors: Chun Ning
authors: CN
authors: Lau