STM/STS studies of Ca-intercalated bilayer graphene

ORAL

Abstract

We have performed low temperature scanning tunneling microscopy/spectroscopy (STM/STS) measurements on a two-dimensional Ca-intercalated bilayer graphene epitaxially grown on a 6H-SiC(0001) substrate. The STM topographic images clearly resolve each intercalated Ca atom with graphene-based honeycomb lattice. Furthermore, we found a clear $\times$2.5 modulation in the topography, implying charge density wave or Moir\'{e} pattern originated from the interaction with the SiC substrate. Comparison with ARPES measurements provided us of further insight into the Fermi surface deduced from STS.

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Authors

  • Ryota Shimizu

    • Advanced Institute for Materials Research (WPI-AIMR), Tohoku University

  • Katsuaki Sugawara

    • Advanced Institute for Materials Research (WPI-AIMR), Tohoku University

  • Kohei Kanetani

    • Department of Physics, Tohoku University

  • Katsuya Iwaya

    • Advanced Institute for Materials Research (WPI-AIMR), Tohoku University

  • Takafumi Sato

    • Department of Physics, Tohoku University

  • Takashi Takahashi

    • Advanced Institute for Materials Research (WPI-AIMR), Tohoku University; Department of Physics, Tohoku University

  • Taro Hitosugi

    • Advanced Institute for Materials Research (WPI-AIMR), Tohoku University