• 文献标题:   Theoretical investigation of the band alignment of graphene on a polar SrTiO3 (111) surface
  • 文献类型:   Article
  • 作  者:   SHIN DH, DEMKOV AA
  • 作者关键词:  
  • 出版物名称:   PHYSICAL REVIEW B
  • ISSN:   2469-9950 EI 2469-9969
  • 通讯作者地址:   Univ Texas Austin
  • 被引频次:   2
  • DOI:   10.1103/PhysRevB.97.075423
  • 出版年:   2018

▎ 摘  要

Doping graphene layers presents a difficult practical and fundamental problem. We consider theoretically, the possibility of electrostatic doping of graphene by the intrinsic field of a polar substrate. By way of example, we perform density functional theory calculations for a graphene sheet placed on the (111)-oriented perovskite SrTiO3 surface. We find that the Fermi surface moves well below the Dirac point of graphene, resulting simultaneously in a fast conducting channel in graphene, and a slow (large-effective-mass) channel at the oxide surface. Additionally, electrostatic gating may open a way to explore peculiar states that, through the "no crossing," represent a hybrid carrier that exists simultaneously in both materials.