【摘 要】
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Introducing metal thin films on two-dimensional(2D)material may present a system to possess exotic properties due to reduced dimensionality and interfacial effects.We deposit Pb islands on single-crystalline graphene on a Ge(110)substrate and studied the
【机 构】
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State Key Laboratory of Functional Materials for Informatics,Shanghai Institute of Microsystem and I
论文部分内容阅读
Introducing metal thin films on two-dimensional(2D)material may present a system to possess exotic properties due to reduced dimensionality and interfacial effects.We deposit Pb islands on single-crystalline graphene on a Ge(110)substrate and studied the nano-and atomic-scale structures and low-energy electronic excitations with scanning tunneling microscopy/spectroscopy(STM/STS).Robust quantum well states(QWSs)are observed in Pb(lll)islands and their os-cillation with film thickness reveals the isolation of free electrons in Pb from the graphene substrate.The spectroscopic characteristics of QWSs are consistent with the band structure of a free-standing Pb(1 11)film.The weak interface coupling is further evidenced by the absence of superconductivity in graphene in close proximity to the superconducting Pb islands.Accordingly,the Pb(l 11)islands on graphene/Ge(l 10)are free-standing in nature,showing very weak electronic coupling to the substrate.
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