TITLE

Measurement of the optical absorption spectra of epitaxial graphene from terahertz to visible

AUTHOR(S)
Dawlaty, Jahan M.; Shivaraman, Shriram; Strait, Jared; George, Paul; Chandrashekhar, Mvs; Rana, Farhan; Spencer, Michael G.; Veksler, Dmitry; Chen, Yunqing
PUB. DATE
September 2008
SOURCE
Applied Physics Letters;9/29/2008, Vol. 93 Issue 13, p131905
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We present experimental results on the optical absorption spectra of epitaxial graphene from the visible to the terahertz frequency range. In the terahertz range, the absorption is dominated by intraband processes with a frequency dependence similar to the Drude model. In the near-IR range, the absorption is due to interband processes and the measured optical conductivity is close to the theoretical value of e2/4h. We extract values for the carrier densities, the number of carbon atom layers, and the intraband scattering times from the measurements.
ACCESSION #
34771929

 

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