Influence of surface and subsurface Co–Ir alloy on the electronic properties of graphene

Using density functional theory (DFT) calculations and angle-resolved photoemission spectroscopy (ARPES) the structural electronic properties of graphene on surface subsurface Co–Ir alloy are investigated upon intercalation Co in graphene/Ir(111). It is found computationally that interaction strength between substrate strongly affected by composition nature an alloy, implying large difference structure monolayer x Ir 1? /Ir(111) Ir/Co /Ir(111). Our theoretical results supported ARPES data, which demonstrate disappearance Dirac cone when lies its restoration formation alloy. • The position CoIr affects layer morphology. presence at interface tends to destroy cone. preserved if formed.