title: Two distinct phases of bilayer graphene films on Ru(0001).
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 the synthesis of two distinct phases of bilayer graphene with different properties. The first phase has Bernal AB stacking with respect to the first graphene layer and 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 an AA stacking sequence with respect to the first layer and 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.
authors.affiliation: Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Trieste, Italy. marco.papagno@fis.unical.it
authors.forename: Marco
authors.initials: M
authors.lastname: Papagno
authors.forename: Daniela
authors.initials: D
authors.lastname: Pacilé
authors.forename: Dinesh
authors.initials: D
authors.lastname: Topwal
authors.forename: Paolo
authors.initials: P
authors.lastname: Moras
authors.forename: Polina Makarovna
authors.initials: PM
authors.lastname: Sheverdyaeva
authors.forename: Fabian Donat
authors.initials: FD
authors.lastname: Natterer
authors.forename: Anne
authors.initials: A
authors.lastname: Lehnert
authors.forename: Stefano
authors.initials: S
authors.lastname: Rusponi
authors.forename: Quentin
authors.initials: Q
authors.lastname: Dubout
authors.forename: Fabian
authors.initials: F
authors.lastname: Calleja
authors.forename: Emmanouil
authors.initials: E
authors.lastname: Frantzeskakis
authors.forename: Stéphane
authors.initials: S
authors.lastname: Pons
authors.forename: Jun
authors.initials: J
authors.lastname: Fujii
authors.forename: Ivana
authors.initials: I
authors.lastname: Vobornik
authors.forename: Marco
authors.initials: M
authors.lastname: Grioni
authors.forename: Carlo
authors.initials: C
authors.lastname: Carbone
authors.forename: Harald
authors.initials: H
authors.lastname: Brune
mesh_terms: D003460:Crystallization / Q000379:methods*; D006108:Graphite / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008567:Membranes, Artificial; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D044367:Phase Transition; D012413:Rubidium / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D046911:Macromolecular Substances; D008567:Membranes, Artificial; D006108:Graphite; D012413:Rubidium