• 文献标题:   Transport measurements across a tunable potential barrier in graphene
  • 文献类型:   Article
  • 作  者:   HUARD B, SULPIZIO JA, STANDER N, TODD K, YANG B, GOLDHABERGORDON D
  • 作者关键词:  
  • 出版物名称:   PHYSICAL REVIEW LETTERS
  • ISSN:   0031-9007 EI 1079-7114
  • 通讯作者地址:   Stanford Univ
  • 被引频次:   502
  • DOI:   10.1103/PhysRevLett.98.236803
  • 出版年:   2007

▎ 摘  要

The peculiar nature of electron scattering in graphene is among many exciting theoretical predictions for the physical properties of this material. To investigate electron scattering properties in a graphene plane, we have created a gate-tunable potential barrier within a single-layer graphene sheet. We report measurements of electrical transport across this structure as the tunable barrier potential is swept through a range of heights. When the barrier is sufficiently strong to form a bipolar junction (n-p-n or p-n-p) within the graphene sheet, the resistance across the barrier sharply increases. We compare these results to predictions for both diffusive and ballistic transport, as the barrier rises on a length scale comparable to the mean free path. Finally, we show how a magnetic field modifies transport across the barrier.