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Comment on "Potential Energy Landscape for Hot Electrons in Periodically Nanostructured Graphene"
In a recent letter [Phys. Rev. Lett. 105 (2010) 036804] the unoccupied
electronic states of single layers of graphene on ruthenium are investigated.
Here we comment on the interpretation, which deviates in four points from [J.
Phys.: Condens. Matter 22 (2010) 302001] and outline the corresponding
consequences
A derivative formula for the free energy function
We consider bond percolation on the lattice. Let be the
number of open clusters in . It is well known that converges to the free energy function at the zero field.
In this paper, we show that converges to
.Comment: 8 pages 1 figur
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