• 文献标题:   Determination of the Fermi velocity of graphene on MoS2 using dual mode scanning tunneling spectroscopy
  • 文献类型:   Article
  • 作  者:   JIAO Z, ZANDVLIET HJW
  • 作者关键词:  
  • 出版物名称:   APPLIED PHYSICS LETTERS
  • ISSN:   0003-6951 EI 1077-3118
  • 通讯作者地址:  
  • 被引频次:   5
  • DOI:   10.1063/5.0046658
  • 出版年:   2021

▎ 摘  要

We have measured the Fermi velocity of graphene on MoS2 using dual mode scanning tunneling spectroscopy. In our method, the tunnel current (I) and the derivate of the current to the gap width (dI/dz) are measured simultaneously as a function of sample bias (V) at a constant tip-substrate distance. Owing to the difference in lattice constants between graphene (2.461 angstrom) and MoS2 (3.161 angstrom), a moire structure is found with a periodicity of 1.07nm and a twist angle of 4 degrees. Our experiments reveal that the electronic band structure of graphene remains intact in the bandgap region of MoS2. The Fermi velocity of graphene on MoS2 is determined to be 1.2 +/- 0.1 x m / s.