Measurement of the Optical Conductivity of Graphene

Abstract

Optical reflectivity and transmission measurements over photon energies between 0.2 and 1.2 eV were performed on single-crystal graphene samples on a SiO2 substrate. For photon energies above 0.5 eV, graphene yielded a spectrally flat optical absorbance of (2.3+/-0.2)%. This result is in agreement with a constant absorbance of pialpha, or a sheet conductivity of pie2/2h, predicted within a model of noninteracting massless Dirac fermions. This simple result breaks down at lower photon energies, where both spectral and sample-to-sample variations were observed. This "nonuniversal" behavior is explained by including the effects of doping and finite temperature, as well as contributions from intraband transitions.

Keywords

Optical conductivityGrapheneMassless particleAbsorbancePhotonConductivityCondensed matter physicsMaterials sciencePhysicsPhoton energyDirac fermionSubstrate (aquarium)DopingMolecular physicsOpticsQuantum mechanicsNanotechnology

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Publication Info

Year: 2008
Type: article
Volume: 101
Issue: 19
Pages: 196405-196405
Citations: 1666
Access: Closed

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APA Style

                            
                                
                                    Kin Fai Mak, 
                                
                                    Matthew Y. Sfeir, 
                                
                                    Yang Wu
                                
                                et al.
                            
                            (2008). 
                            Measurement of the Optical Conductivity of Graphene. 
                            Physical Review Letters
                            , 101
                            (19)
                            , 196405-196405.
                            https://doi.org/10.1103/physrevlett.101.196405
                        

Identifiers

DOI: 10.1103/physrevlett.101.196405