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Observation of Landau levels in potassium-intercalated graphite under a zero magnetic field

Author

Listed:
  • Donghui Guo

    (Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai)

  • Takahiro Kondo

    (Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai)

  • Takahiro Machida

    (Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai)

  • Keigo Iwatake

    (Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai)

  • Susumu Okada

    (Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai)

  • Junji Nakamura

    (Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai)

Abstract

The charge carriers in graphene are massless Dirac fermions and exhibit a relativistic Landau-level quantization in a magnetic field. Recently, it has been reported that, without any external magnetic field, quantized energy levels have been also observed from strained graphene nanobubbles on a platinum surface, which were attributed to the Landau levels of massless Dirac fermions in graphene formed by a strain-induced pseudomagnetic field. Here we show the generation of the Landau levels of massless Dirac fermions on a partially potassium-intercalated graphite surface without applying external magnetic field. Landau levels of massless Dirac fermions indicate the graphene character in partially potassium-intercalated graphite. The generation of the Landau levels is ascribed to a vector potential induced by the perturbation of nearest-neighbour hopping, which may originate from a strain or a gradient of on-site potentials at the perimeters of potassium-free domains.

Suggested Citation

  • Donghui Guo & Takahiro Kondo & Takahiro Machida & Keigo Iwatake & Susumu Okada & Junji Nakamura, 2012. "Observation of Landau levels in potassium-intercalated graphite under a zero magnetic field," Nature Communications, Nature, vol. 3(1), pages 1-6, January.
    • Handle: RePEc:nat:natcom:v:3:y:2012:i:1:d:10.1038_ncomms2072
    DOI: 10.1038/ncomms2072
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