Two Distinct Phases of Bilayer Graphene Films on Ru(0001)
arXiv:1301.1610 · doi:10.1021/nn303821w
Abstract
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 moiré 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.
References in corpus (18)
- Electric Field Effect in Atomically Thin Carbon Films
- Two-Dimensional Gas of Massless Dirac Fermions in Graphene
- Experimental Observation of Quantum Hall Effect and Berry's Phase in Graphene
- Boron nitride substrates for high-quality graphene electronics
- Room-Temperature Quantum Hall Effect in Graphene
- Gate-induced insulating state in bilayer graphene devices
- Asymmetry gap in the electronic band structure of bilayer graphene
- Single Layer Behavior and Its Breakdown in Twisted Graphene Layers
- Periodically rippled graphene: growth and spatially resolved electronic structure
- Dirac Cones and Minigaps for Graphene on Ir(111)
- Broken symmetry states and divergent resistance in suspended bilayer graphene
- Electronic Structure of Few-Layer Graphene: Experimental Demonstration of Strong Dependence on Stacking Sequence
- Unit cell of graphene on Ru(0001): a 25 x 25 supercell with 1250 carbon atoms
- Is graphene on Ru(0001) a nanomesh?
- Imaging the interface of epitaxial graphene with silicon carbide via scanning tunneling microscopy
- Microscopic Polarization in Bilayer Graphene
- First principles study of the graphene/Ru(0001) interface
- Large Bandgap Opening Between Graphene Dirac Cones Induced by Na Adsorption onto an Ir Superlattice