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High quality epitaxial graphene films can be applied as templates fortailoring graphene-substrate interfaces that allow for precise control of thecharge carrier behavior in graphene through doping and many-body effects. Bycombining scanning tunneling microscopy, angle-resolved photoemissionspectroscopy and density functional theory we demonstrate that oxygenintercalated epitaxial graphene on Ir(111) has high structural quality, isquasi free-standing, and shows signatures of many-body interactions. Using thissystem as a template, we show that tunable pn-junctions can be patterned byadsorption and intercalation of rubidium, and that the n-doped graphene regionsexhibit a reduced Coulomb screening via enhanced electron-plasmon coupling.These findings are central for understanding and tailoring the properties ofgraphene-metal contacts e.g. for realizing quantum tunneling devices.

High Crystallinity and Decoupling of Graphene on a Metal: Reduced Coulomb Screening and Tunable pn-Junctions