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

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons21910

Nemec,  Lydia
Theory, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons22010

Rinke,  Patrick
Theory, Fritz Haber Institute, Max Planck Society;
COMP/Department of Applied Physics, Aalto University;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons21379

Blum,  Volker
Theory, Fritz Haber Institute, Max Planck Society;
Duke University, MEMS Department, Durham, NC 27708, USA;

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Fulltext (public)

PhysRevLett.114.106804.pdf
(Publisher version), 604KB

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Citation

Sforzini, J., Nemec, L., Denig, T., Stadtmüller, B., Lee, T.-L., Kumpf, C., et al. (2015). Approaching Truly Freestanding Graphene: The Structure of Hydrogen-Intercalated Graphene on 6H-SiC(0001). Physical Review Letters, 114(10): 106804. doi:10.1103/PhysRevLett.114.106804.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0025-6CD7-4
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.