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We present a theoretical study of resonance characteristics in graphene fromadatoms with $s$ or $p_z$ character binding in top, bridge, and hollowpositions. The adatoms are described by two tight-binding parameters: onsiteenergy and hybridization strength. We explore a wide range of differentmagnitudes of these parameters by employing T-matrix calculations in the singleadatom limit and by tight-binding supercell calculations for dilute adatomcoverage. We calculate the density of states and the momentum relaxation rateand extract the resonance level and resonance width. Top position with largehybridization strength or, equivalently, small onsite energy, inducesresonances close to zero energy. Bridge position, compared to top, is moresensitive to variation in the orbital tight-binding parameters. Resonanceswithin the experimentally relevant energy window are found mainly for bridgeadatoms with negative onsite energies. The effect of resonances from top andbridge position on the density of states and momentum relaxation rate iscomparable and both positions give rise to power-law decay of the resonantstate in graphene. Hollow position with $s$ orbital character is affected fromdestructive interference which is seen from very narrow resonance peaks in thedensity of states and momentum relaxation rate. The resonant state shows noclear tendency to power-law decay around the impurity and its magnitudedecreases strongly with lowering the adatom content in the supercellcalculations. This is in contrast to top and bridge position. We conclude ourstudy with a comparison to models of point-like vacancies and strong midgapscatterers. The latter model gives rise to significantly higher momentumrelaxation rates than caused by single adatoms.

Resonant scattering due to adatoms in graphene: top, bridge, and hollow position