Abstract
We have performed an ab initio investigation of graphene adsorption on clean and Au-covered InAs(110) surfaces. Total energy results reveal that the graphene sheet is weakly attached to such surfaces, with adsorption energy of approximately 25 meV/(C atom). Graphene nanoribbons, on the other hand, are more strongly adsorbed, with adsorption energy of approximately 45 meV/(C atom). Based upon our electronic band structure calculations, we find that there are small net charge transfers between the graphene sheet or ribbon and the clean or Au-covered InAs(110) surface. There is an electronic charge displacement in the graphene-surface interface region, giving rise to an electric dipole moment along the surface normal. Scanning tunneling microscopy simulations lend support to the recently proposed ``transparency'' effect of the graphene sheet adsorbed on the clean InAs(110) surface [He et al., Nano Lett. 10, 3446 (2010)] and suggest that the effect is maintained for adsorption on the metallic Au/InAs(110) surface.
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