Measurement of the optical conductivity of graphene
Optical reflectivity and transmission measurements over photon energies between 0.2 and
1.2 eV were performed on single-crystal graphene samples on a SiO 2 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 π α, or a sheet conductivity of π e
2/2 h, 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 …
1.2 eV were performed on single-crystal graphene samples on a SiO 2 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 π α, or a sheet conductivity of π e
2/2 h, 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 …
Optical reflectivity and transmission measurements over photon energies between 0.2 and 1.2 eV were performed on single-crystal graphene samples on a substrate. For photon energies above 0.5 eV, graphene yielded a spectrally flat optical absorbance of . This result is in agreement with a constant absorbance of , or a sheet conductivity of , 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.
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