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We present a theoretical study of the optical conductivity of graphene withmagnetic and nonmagnetic adatoms. First, by introducing alternating potentialin a pure graphene, we demonstrate a gap formation in the density of states andthe corresponding optical conductivity. We highlight the distinction betweensuch a gap formation and the so-called Pauli blocking effect. Next, we applythis idea to graphene with adatoms by introducing magnetic interactions betweenthe carrier spins and the spins of the adatoms. Exploring various possibleground-state spin configurations of the adatoms, we find that antiferromagneticconfiguration yields the lowest total electronic energy, and is the onlyconfiguration that forms a gap. Furthermore, we analyze four differentcircumstances leading to similar gaplike structures and propose a means tointerpret the magneticity and the possible orderings of the adatoms on graphenesolely from the optical conductivity data. We apply this analysis to therecently reported experimental data of oxygenated graphene.

Theoretical study of optical conductivity of graphene with magnetic and nonmagnetic adatoms