• 文献标题:   Negative Coulomb Drag in Double Bilayer Graphene
  • 文献类型:   Article
  • 作  者:   LI JIA, TANIGUCHI T, WATANABE K, HONE J, LEVCHENKO A, DEAN CR
  • 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:   Columbia Univ
  • 被引频次:   40
  • DOI:   10.1103/PhysRevLett.117.046802
  • 出版年:   2016

▎ 摘  要

We report on an experimental measurement of Coulomb drag in a double quantum well structure consisting of bilayer-bilayer graphene, separated by few layer hexagonal boron nitride. At low temperatures and intermediate densities, a novel negative drag response with an inverse sign is observed, distinct from the momentum and energy drag mechanisms previously reported in double monolayer graphene. By varying the device aspect ratio, the negative drag component is suppressed and a response consistent with pure momentum drag is recovered. In the momentum drag dominated regime, excellent quantitative agreement with the density and temperature dependence predicted for double bilayer graphene is found.