title: Tuning the Proximity Effect through Interface Engineering in a Pb/Graphene/Pt Trilayer System.
abstract: The fate of superconductivity of a nanoscale superconducting film/island relies on the environment; for example, the proximity effect from the substrate plays a crucial role when the film thicknesses is much less than the coherent length. Here, we demonstrate that atomic-scale tuning of the proximity effects can be achieved by one atomically thin graphene layer inserted between the nanoscale Pb islands and the supporting Pt(111) substrate. By using scanning tunneling microscopy and spectroscopy, we show that the coupling between the electron in a normal metal and the Cooper pair in an adjacent superconductor is dampened by 1 order of magnitude via transmission through a single-atom-thick graphene. More interestingly, the superconductivity of the Pb islands is greatly affected by the moiré patterns of graphene, showing the intriguing influence of the graphene-substrate coupling on the superconducting properties of the overlayer.
authors.affiliation: Institute of Physics, Chinese Academy of Sciences and Beijing Key Laboratory for Nanomaterials and Nanodevices , P.O. Box 603, Beijing 100190, China.
authors.forename: Xiangmin
authors.initials: X
authors.lastname: Fei
authors.affiliation: Institute of Physics, Chinese Academy of Sciences and Beijing Key Laboratory for Nanomaterials and Nanodevices , P.O. Box 603, Beijing 100190, China.
authors.forename: Wende
authors.initials: W
authors.lastname: Xiao
authors.affiliation: Institute of Physics, Chinese Academy of Sciences and Beijing Key Laboratory for Nanomaterials and Nanodevices , P.O. Box 603, Beijing 100190, China.
authors.forename: Kai
authors.initials: K
authors.lastname: Yang
authors.affiliation: Institute of Physics, Chinese Academy of Sciences and Beijing Key Laboratory for Nanomaterials and Nanodevices , P.O. Box 603, Beijing 100190, China.
authors.forename: Liwei
authors.initials: L
authors.lastname: Liu
authors.affiliation: Institute of Physics, Chinese Academy of Sciences and Beijing Key Laboratory for Nanomaterials and Nanodevices , P.O. Box 603, Beijing 100190, China.
authors.forename: Jinbo
authors.initials: J
authors.lastname: Pan
authors.affiliation: Institute of Physics, Chinese Academy of Sciences and Beijing Key Laboratory for Nanomaterials and Nanodevices , P.O. Box 603, Beijing 100190, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Chen
authors.affiliation: Institute of Physics, Chinese Academy of Sciences and Beijing Key Laboratory for Nanomaterials and Nanodevices , P.O. Box 603, Beijing 100190, China.|Department of Physics, The University of Texas at Austin , Austin, Texas 78712, United States.
authors.forename: Chendong
authors.initials: C
authors.lastname: Zhang
authors.affiliation: Department of Physics, The University of Texas at Austin , Austin, Texas 78712, United States.
authors.forename: Chih-Kang
authors.initials: CK
authors.lastname: Shih
authors.affiliation: Institute of Physics, Chinese Academy of Sciences and Beijing Key Laboratory for Nanomaterials and Nanodevices , P.O. Box 603, Beijing 100190, China.
authors.forename: Shixuan
authors.initials: S
authors.lastname: Du
authors.affiliation: Institute of Physics, Chinese Academy of Sciences and Beijing Key Laboratory for Nanomaterials and Nanodevices , P.O. Box 603, Beijing 100190, China.
authors.forename: Hongjun
authors.initials: H
authors.lastname: Gao
keywords: Pb; graphene; scanning tunneling microscopy; superconductivity