%0 Journal Article
%A Sforzini, J.
%A Nemec, L.
%A Denig, T.
%A Stadtmüller, B.
%A Lee, T.-L.
%A Kumpf, C.
%A Subach, Sergey
%A Starke, U.
%A Rinke, P.
%A Blum, V.
%A Posseik, Francois
%A Tautz, Frank Stefan
%T Approaching Truly Freestanding Graphene: The Structure of Hydrogen-Intercalated Graphene on 6H−SiC(0001)
%J Physical review letters
%V 114
%N 10
%@ 1079-7114
%C College Park, Md.
%I APS
%M FZJ-2015-01932
%P 106804
%D 2015
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000352073400018
%$ pmid:25815955
%R 10.1103/PhysRevLett.114.106804
%U https://juser.fz-juelich.de/record/188581