2014/04/24 by Søren Ulstrup, Mie Andersen, Ulstrup, Søren +11
Engineering · Materials Science · #2D Materials and Applications #Advancements in Battery Materials #FOS: Physical sciences #Graphene research and applications #Materials Science (cond-mat.mtrl-sci)
paper · pdf · doi:10.48550/arxiv.1404.6132
openalex publication_date 2014/04/24 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
High quality epitaxial graphene films can be applied as templates for tailoring graphene-substrate interfaces that allow for precise control of the charge carrier behavior in graphene through doping and many-body effects. By combining scanning tunneling microscopy, angle-resolved photoemission spectroscopy and density functional theory we demonstrate that oxygen intercalated epitaxial graphene on Ir(111) has high structural quality, is quasi free-standing, and shows signatures of many-body interactions. Using this system as a template, we show that tunable pn-junctions can be patterned by adsorption and intercalation of rubidium, and that the n-doped graphene regions exhibit a reduced Coulomb screening via enhanced electron-plasmon coupling. These findings are central for understanding and tailoring the properties of graphene-metal contacts e.g. for realizing quantum tunneling devices.