▎ 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.