title: Approaching truly freestanding graphene: the structure of hydrogen-intercalated graphene on 6H-SiC(0001).
abstract: We measure the adsorption height of hydrogen-intercalated quasifreestanding monolayer graphene on the (0001) face of 6H silicon carbide by the normal incidence x-ray standing wave technique. A density functional calculation for the full (6√3×6√3)-R30° unit cell, based on a van der Waals corrected exchange correlation functional, finds a purely physisorptive adsorption height in excellent agreement with experiments, a very low buckling of the graphene layer, a very homogeneous electron density at the interface, and the lowest known adsorption energy per atom for graphene on any substrate. A structural comparison to other graphenes suggests that hydrogen-intercalated graphene on 6H-SiC(0001) approaches ideal graphene.
authors: Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany.|Jülich Aachen Research Alliance (JARA), Fundamentals of Future Information Technology, 52425 Jülich, Germany.
authors: J
authors: J
authors: Sforzini
authors: Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195 Berlin, Germany.
authors: L
authors: L
authors: Nemec
authors: Max Planck Institute for Solid State Research, Heisenbergstraße, 70569 Stuttgart, Germany.
authors: T
authors: T
authors: Denig
authors: Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany.|Jülich Aachen Research Alliance (JARA), Fundamentals of Future Information Technology, 52425 Jülich, Germany.
authors: B
authors: B
authors: Stadtmüller
authors: Diamond Light Source Ltd, Didcot, OX110DE Oxfordshire, United Kingdom.
authors: T-L
authors: TL
authors: Lee
authors: Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany.|Jülich Aachen Research Alliance (JARA), Fundamentals of Future Information Technology, 52425 Jülich, Germany.
authors: C
authors: C
authors: Kumpf
authors: Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany.|Jülich Aachen Research Alliance (JARA), Fundamentals of Future Information Technology, 52425 Jülich, Germany.
authors: S
authors: S
authors: Soubatch
authors: Max Planck Institute for Solid State Research, Heisenbergstraße, 70569 Stuttgart, Germany.
authors: U
authors: U
authors: Starke
authors: Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195 Berlin, Germany.|COMP/Department of Applied Physics, Aalto University, P.O. Box 11100, Aalto FI-00076, Finland.
authors: P
authors: P
authors: Rinke
authors: Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195 Berlin, Germany.|Department of Mechanical Engineering and Material Science, Duke University, Durham, North Carolina 27708, USA.
authors: V
authors: V
authors: Blum
authors: Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany.|Jülich Aachen Research Alliance (JARA), Fundamentals of Future Information Technology, 52425 Jülich, Germany.
authors: F C
authors: FC
authors: Bocquet
authors: Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany.|Jülich Aachen Research Alliance (JARA), Fundamentals of Future Information Technology, 52425 Jülich, Germany.
authors: F S
authors: FS
authors: Tautz