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High-resolution tunnelling spectroscopy of a graphene quartet

Author

Listed:
  • Young Jae Song

    (Center for Nanoscale Science and Technology, NIST
    Maryland NanoCenter, University of Maryland)

  • Alexander F. Otte

    (Center for Nanoscale Science and Technology, NIST
    Maryland NanoCenter, University of Maryland)

  • Young Kuk

    (Seoul National University)

  • Yike Hu

    (School of Physics, Georgia Institute of Technology)

  • David B. Torrance

    (School of Physics, Georgia Institute of Technology)

  • Phillip N. First

    (School of Physics, Georgia Institute of Technology)

  • Walt A. de Heer

    (School of Physics, Georgia Institute of Technology)

  • Hongki Min

    (Center for Nanoscale Science and Technology, NIST
    Maryland NanoCenter, University of Maryland)

  • Shaffique Adam

    (Center for Nanoscale Science and Technology, NIST)

  • Mark D. Stiles

    (Center for Nanoscale Science and Technology, NIST)

  • Allan H. MacDonald

    (University of Texas at Austin)

  • Joseph A. Stroscio

    (Center for Nanoscale Science and Technology, NIST)

Abstract

Graphene's quantum quartet The unique electronic structure of graphene, a material made of carbon sheets just one atom thick, makes it of interest both to materials scientists looking for possible technological applications and to the study of fundamental aspects of physics. Young Jae Song et al. have studied one aspect of graphene's uniqueness — the fourfold energy degeneracy that means that a single Landau level (a peak in the density of states produced by a magnetic field) consists of four separate quantum states. Using a high-resolution scanning tunnelling microscope that operates at a record low temperature of down to 10 millikelvin, they perform tunnelling spectroscopy measurements on epitaxial graphene. They obtain spectral fingerprints of the Landau levels, showing in fine detail how they evolve with magnetic fields and how they split (at high fields) into the four separate quantum states. The authors observe states with fractional Landau level filling factors of 7/2, 9/2 and 11/2, which are suggestive of new many-body states in graphene.

Suggested Citation

  • Young Jae Song & Alexander F. Otte & Young Kuk & Yike Hu & David B. Torrance & Phillip N. First & Walt A. de Heer & Hongki Min & Shaffique Adam & Mark D. Stiles & Allan H. MacDonald & Joseph A. Strosc, 2010. "High-resolution tunnelling spectroscopy of a graphene quartet," Nature, Nature, vol. 467(7312), pages 185-189, September.
    • Handle: RePEc:nat:nature:v:467:y:2010:i:7312:d:10.1038_nature09330
    DOI: 10.1038/nature09330
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