Tuning the Proximity Effect through Interface Engineering in a Pb/Graphene/Pt Trilayer System

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• 作者：Xiangmin Fei ; Wende Xiao ; Kai Yang ; Liwei Liu ; Jinbo Pan ; Hui Chen ; Chendong Zhang ; Chih-Kang Shih ; Shixuan Du ; Hongjun Gao
• 刊名：ACS Nano
• 出版年：2016
• 出版时间：April 26, 2016
• 年：2016
• 卷：10
• 期：4
• 页码：4520-4524
• 全文大小：281K
• 年卷期：0
• ISSN：1936-086X

文摘

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.