Phase separation of hydrogen atoms adsorbed on graphene and the smoothness of the graphene-graphane interface

Details Phase separation of hydrogen atoms adsorbed on graphene and the smoothness of the graphene-graphane interface Phase separation of hydrogen atoms adsorbed on graphene and the smoothness of the graphene-graphane interface

2011-11-04

arxiv.org/abs/1111.1038v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 4 eps figures, submitted to Phys. Rev. B

Scientific paper

The electronic properties of a graphene sheet with attached hydrogen atoms is studied using a modified Falicov-Kimball model on the honeycomb lattice. It is shown that in the ground state this system separates into two phases: fully hydrogenated graphene (graphane) and hydrogen-free graphene. The graphene-graphane boundary acquires a positive interface tension. Therefore, the graphene-graphane interface becomes a straight line, slightly rippled by thermal fluctuations. A smooth interface may be useful for the fabrication of mesoscopic graphene-based devices.

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