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Competing ordered states with filling factor two in bilayer graphene

Author

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  • J. Velasco Jr

    (University of California
    Present address: Department of Physics, University of California, Berkeley, California 94709, USA)

  • Y. Lee

    (University of California)

  • F. Zhang

    (University of Pennsylvania
    University of Texas at Dallas)

  • K. Myhro

    (University of California)

  • D. Tran

    (University of California)

  • M. Deo

    (University of California)

  • D. Smirnov

    (National High Magnetic Field Laboratory)

  • A. H. MacDonald

    (University of Texas at Austin)

  • C. N. Lau

    (University of California)

Abstract

The quantum Hall effect, in which a two-dimensional sample’s Hall conductivities become quantized, is a remarkable transport anomaly commonly observed at strong magnetic fields. However, it may also appear at zero magnetic field if time-reversal symmetry is broken. Charge-neutral bilayer graphene is unstable to a variety of competing and closely related broken symmetry states, some of which have non-zero quantized Hall conductivities. Here we explore those states by stabilizing them with external fields. Transport spectroscopy measurements reveal two distinct states that have two quantum units of Hall conductivity, stabilized by large magnetic and electric fields, respectively. The majority spins of both phases form a quantum anomalous Hall state, and the minority spins constitute a Kekulé state with spontaneous valley coherence for phase I and a quantum valley Hall state for phase II. Our results shed light on the rich set of competing ordered states in bilayer graphene.

Suggested Citation

  • J. Velasco Jr & Y. Lee & F. Zhang & K. Myhro & D. Tran & M. Deo & D. Smirnov & A. H. MacDonald & C. N. Lau, 2014. "Competing ordered states with filling factor two in bilayer graphene," Nature Communications, Nature, vol. 5(1), pages 1-5, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms5550
    DOI: 10.1038/ncomms5550
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