Electronic properties and interfacial coupling in Pb islands on single-crystalline graphene

• 作者: Jing-Peng Song Ang Li
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2022,（3）
• 所属期刊栏目: CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES
• 页码范围: 585-588
• 页数: 4页
• 语种: 英文
• DOI: 10.1088/1674-1056/ac1b8e

摘要

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.