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A Model Dielectric Function for Graphene from the Infrared to the Ultraviolet

Published online by Cambridge University Press:  12 April 2013

A. Boosalis ,
R. Elmquist ,
M. Real ,
N. Nguyen ,
M. Schubert  and
T. Hofmann
A. Boosalis
Affiliation:
Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68508 National Institute of Standards and Technology, Gaithersburg, MD 20899
R. Elmquist
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD 20899
M. Real
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD 20899
N. Nguyen
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD 20899
M. Schubert
Affiliation:
Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68508
T. Hofmann
Affiliation:
Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68508
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Abstract

A modified critical point model dielectric function for graphene is derived here and used to analyze spectroscopic ellipsometry data obtained over a wide spectral range from 3 to 9 eV. Critical point and exciton resonance energies are extracted and discussed. Our findings indicate that epitaxial graphene on SiC to exhibits equivalent exciton behavior to that of suspended graphene. We further apply our model dielectric function to evaluate dielectric function data for highly oriented pyrolytic graphite reported in the literature. Excellent agreement is found between the critical point model developed here and the literature data even for the low energy spectral range up to 1 eV.

Keywords

Coptical propertieselectronic structure
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1505: Symposium W – Carbon Nanomaterials , 2013 , mrsf12-1505-w10-80
Copyright
Copyright © Materials Research Society 2013

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References

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