Physics – Condensed Matter – Materials Science
Scientific paper
2009-11-10
Phys. Rev. Lett. 103, 246804 (2009)
Physics
Condensed Matter
Materials Science
Accepted for publication in Physical Review Letters
Scientific paper
10.1103/PhysRevLett.103.246804
Quasi-free standing epitaxial graphene is obtained on SiC(0001) by hydrogen intercalation. The hydrogen moves between the 6root3 reconstructed initial carbon layer and the SiC substrate. The topmost Si atoms which for epitaxial graphene are covalently bound to this buffer layer, are now saturated by hydrogen bonds. The buffer layer is turned into a quasi-free standing graphene monolayer with its typical linear pi-bands. Similarly, epitaxial monolayer graphene turns into a decoupled bilayer. The intercalation is stable in air and can be reversed by annealing to around 900 degrees Celsius.
Coletti Camilla
Iwasaki Takaya
Riedl Christoph
Starke Ulrich
Zakharov Alexander
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