• 文献标题:   Effects of Metallic Contacts on Electron Transport through Graphene
  • 文献类型:   Article
  • 作  者:   BARRAZALOPEZ S, VANEVIC M, KINDERMANN M, CHOU MY
  • 作者关键词:  
  • 出版物名称:   PHYSICAL REVIEW LETTERS
  • ISSN:   0031-9007
  • 通讯作者地址:   Georgia Inst Technol
  • 被引频次:   116
  • DOI:   10.1103/PhysRevLett.104.076807
  • 出版年:   2010

▎ 摘  要

We report on a first-principles study of the conductance through graphene suspended between Al contacts as a function of junction length, width, and orientation. The charge transfer at the leads and into the freestanding section gives rise to an electron-hole asymmetry in the conductance and in sufficiently long junctions induces two conductance minima at the energies of the Dirac points for suspended and clamped regions, respectively. We obtain the potential profile along a junction caused by doping and provide parameters for effective model calculations of the junction conductance with weakly interacting metallic leads.