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Two Distinct Phases of Bilayer Graphene Films on Ru(0001)

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arxiv 1301.1610 v1 pith:RTEQW25C submitted 2013-01-08 cond-mat.mes-hall cond-mat.mtrl-sci

Two Distinct Phases of Bilayer Graphene Films on Ru(0001)

classification cond-mat.mes-hall cond-mat.mtrl-sci
keywords graphenefirstlayerphasebilayerdiracdisplaysdistinct
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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By combining angle-resolved photoemission spectroscopy and scanning tunneling microscopy we reveal the structural and electronic properties of multilayer graphene on Ru(0001). We prove that large ethylene exposure allows to synthesize two distinct phases of bilayer graphene with different properties. The first phase has Bernal AB stacking with respect to the first graphene layer, displays weak vertical interaction and electron doping. The long-range ordered moir\'e pattern modulates the crystal potential and induces replicas of the Dirac cone and minigaps. The second phase has AA stacking sequence with respect to the first layer, displays weak structural and electronic modulation and p-doping. The linearly dispersing Dirac state reveals the nearly-freestanding character of this novel second layer phase.

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