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

Muhammad Aziz Majidi, Syahril Siregar, Andrivo Rusydi

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

We present a theoretical study of the optical conductivity of graphene with magnetic and nonmagnetic adatoms. First, by introducing an alternating potential in a pure graphene, we demonstrate a gap formation in the density of states and the corresponding optical conductivity. We highlight the distinction between such a gap formation and the so-called Pauli blocking effect. Next, we apply this idea to graphene with adatoms by introducing magnetic interactions between the carrier spins and the spins of the adatoms. Exploring various possible ground-state spin configurations of the adatoms, we find that the antiferromagnetic configuration yields the lowest total electronic energy and is the only configuration that forms a gap. Furthermore, we analyze four different circumstances leading to similar gaplike structures and propose a means to interpret the magneticity and the possible orderings of the adatoms on graphene solely from the optical conductivity data. We apply this analysis to the recently reported experimental data of oxygenated graphene.

Original languageEnglish
Article number195442
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number19
DOIs
Publication statusPublished - 24 Nov 2014

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