Approaching truly freestanding graphene: The structure of hydrogen-intercalated graphene on 6h-Sic (0001)

J. Sforzini, L. Nemec, T. Denig, B. Stadtmüller, T. L. Lee, C. Kumpf, S. Soubatch, U. Starke, P. Rinke, V. Blum, F. C. Bocquet, F. S. Tautz

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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 (63×63)-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.

Original languageEnglish
Article number106804
JournalPhysical Review Letters
Volume114
Issue number10
DOIs
StatePublished - 10 Mar 2015
Externally publishedYes

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