Abstract
We measure the adsorption height of hydrogen-intercalated quasifreestanding monolayer graphene on the (0001) face of silicon carbide by the normal incidence x-ray standing wave technique. A density functional calculation for the full 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 approaches ideal graphene.
- Received 13 November 2014
DOI:https://doi.org/10.1103/PhysRevLett.114.106804
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Published by the American Physical Society