We use the non-interacting tight-binding model to study the effect of
isolated hydrogen adsorbates on the quasiparticle spectra of single-layer
graphene. Using the Green's function approach, we obtain analytic expressions
for the local density of states and the spectral function of hydrogen-doped
graphene, which are also numerically evaluated and plotted. Our results are
relevant for the interpretation of scanning tunneling microscopy and
angle-resolved photoemission spectroscopy data of functionalized graphene.Comment: 4 pages, 3 figures, minor corrections to tex