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Approaching Truly Freestanding Graphene: The Structure of Hydrogen-Intercalated Graphene on 6H-SiC(0001)

DOI: 10.1103/PhysRevLett.114.106804 DOI Help
PMID: 25815955 PMID Help

Authors: J. Sforzini (Forschungszentrum Jülich GmbH) , L. Nemec (Fritz-Haber-Institut der Max-Planck-Gesellschaft) , T. Denig (Max Planck Institute for Solid State Research) , B. Stadtmüller (Forschungszentrum Jülich GmbH) , T. L Lee (Diamond Light Source) , C. Kumpf (Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich) , S. Soubatch (Forschungszentrum Jülich GmbH) , U. Starke (Max Planck Institute for Solid State Research) , P. Rinke (Fritz-Haber-Institut der Max-Planck-Gesellschaft) , V. Blum (Fritz-Haber-Institut der Max-Planck-Gesellschaft) , Francois Bocquet (Forschungszentrum Jülich GmbH) , Stefan Tautz (Forschungszentrum Jülich GmbH)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Letters , VOL 114 , PAGES 106804

State: Published (Approved)
Published: March 2015
Diamond Proposal Number(s): 8449 , 10271

Open Access Open Access

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 ð6 ffiffiffi 3 p × 6 ffiffiffi 3 p Þ-R30° unit cell, based on a van derWaals 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.Astructural comparison to other graphenes suggests that hydrogen-intercalated graphene on 6H-SiCð0001Þ approaches ideal graphene.

Subject Areas: Physics, Chemistry


Instruments: I09-Surface and Interface Structural Analysis