Measurement of the opptical conductivity of graphene

Kin Fai Mak, Matthew Y. Sfeir, Yang Wu, Chun Hung Lui, James A. Misewich, Tony F. Heinz

Research output: Contribution to journalArticle

1018 Citations (Scopus)

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 πα, or a sheet conductivity of πe2/2h, 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.

Original languageEnglish (US)
Article number196405
JournalPhysical Review Letters
Volume101
Issue number19
DOIs
StatePublished - Nov 7 2008

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graphene
conductivity
photons
energy
breakdown
fermions
reflectance
single crystals
temperature

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Mak, K. F., Sfeir, M. Y., Wu, Y., Lui, C. H., Misewich, J. A., & Heinz, T. F. (2008). Measurement of the opptical conductivity of graphene. Physical Review Letters, 101(19), [196405]. https://doi.org/10.1103/PhysRevLett.101.196405
Mak, Kin Fai ; Sfeir, Matthew Y. ; Wu, Yang ; Lui, Chun Hung ; Misewich, James A. ; Heinz, Tony F. / Measurement of the opptical conductivity of graphene. In: Physical Review Letters. 2008 ; Vol. 101, No. 19.
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Mak, KF, Sfeir, MY, Wu, Y, Lui, CH, Misewich, JA & Heinz, TF 2008, 'Measurement of the opptical conductivity of graphene', Physical Review Letters, vol. 101, no. 19, 196405. https://doi.org/10.1103/PhysRevLett.101.196405

Measurement of the opptical conductivity of graphene. / Mak, Kin Fai; Sfeir, Matthew Y.; Wu, Yang; Lui, Chun Hung; Misewich, James A.; Heinz, Tony F.

In: Physical Review Letters, Vol. 101, No. 19, 196405, 07.11.2008.

Research output: Contribution to journalArticle

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AU - Mak, Kin Fai

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AU - Heinz, Tony F.

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AB - 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 πα, or a sheet conductivity of πe2/2h, 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.

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Mak KF, Sfeir MY, Wu Y, Lui CH, Misewich JA, Heinz TF. Measurement of the opptical conductivity of graphene. Physical Review Letters. 2008 Nov 7;101(19). 196405. https://doi.org/10.1103/PhysRevLett.101.196405