Measurement of the optical conductivity of graphene.
By K. Mak, M. Sfeir, Yang Wu, C. Lui, J. Misewich, T. Heinz. Physical Review Letters, 2008
1,413 citations recorded by the source corpus.
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.
Subfields: Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/3ed5efb8a4716e136056ab9ff0ceefbf54491a65
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In Materials Chemistry
Citations in the corpus
- Colloquium: The transport properties of graphene: An introduction (2010, background): “According to Mak et al. (Mak et al., 2008), and for energies Eγ <0.5 eV, both temperature effects and some amount of variable extrinsic doping decrease the conductivity and therefore produce an increase in the transmittance.”
- Plasma-assisted fabrication of monolayer phosphorene and its Raman characterization (2014, background): “The optical contrast value of phosphorene is larger compared to that of graphene, which may imply that the optical absorption of phosphorene is stronger than that of graphene[18].”
- Synthesis, characterization and optical limiting property of covalently oligothiophene-functionalized graphene material (2009, background): “[4] Mak KF, Sfeir MY, Wu Y, Lui CH, Misewich JA, Heinz TF.”
- Holographic Quantum Critical Transport without Self-Duality (2010, background): “Graphene also has characteristics of a quantum-critical system with moderately strong interactions [15], and its conductivity has been measured [16, 17] in the optical regime where ω T ; a frequency-independent conductivity was found, equal to that of free Dirac fermions.”