• 文献标题:   The transport properties in graphene/single-unit-cell cuprates van der Waals heterostructure
  • 文献类型:   Article
  • 作  者:   WU YF, XIAO H, LIL Q, LI XJ, LI ZJ, MU G, JIANG D, HU T, XIE XM
  • 作者关键词:   graphene, superconductivity, bi2212, van der waal, single unit cell, heterojunction
  • 出版物名称:   SUPERCONDUCTOR SCIENCE TECHNOLOGY
  • ISSN:   0953-2048 EI 1361-6668
  • 通讯作者地址:   Chinese Acad Sci
  • 被引频次:   1
  • DOI:   10.1088/1361-6668/ab2097
  • 出版年:   2019

▎ 摘  要

Inducing superconductivity into graphene by a proximity effect offers a chance to study exotic physics phenomena involved in Cooper pairs on a Dirac fermions system. Here we fabricate the monolayer graphene/single-unit-cell Bi2Sr2CaCu2O8+x (single-unit-cell Bi2212) van der Waals heterostructure, where the atomically flat surface from mechanically exfoliated single-unit-cell Bi2212 is the key to the pronounced proximity effect. The transport measurements in combination with direct and alternating current are performed on graphene/single-unit-cell Bi2212. The superconductivity is observed at the graphene/single-unit-cell Bi2212 heterostructure below 86 K. In the superconducting state, the nonlinear drain current-voltage relation is seen reflecting the characterisation of the Dirac-fermionic band structure of graphene. While for a lower bias, the differential conductance spectra shows a small subgap up to 60 K, implying a proximity-induced high-temperature superconductivity in graphene. Our results open a new way to study the superconductivity in two-dimensional Dirac fermion systems.