Spatially resolved raman spectroscopy of single- and few-layer graphene

Nano Letters

Volumn 7, Issue 2, 2007, Pages 238-242

  Graf, D ^a   Molitor, F ^a   Ensslin, K ^a   Stampfer, C ^a   Jungen, A ^a   Hierold, C ^a   Wirtz, L ^b  

^a ETH ZURICH   (Switzerland)

^b INSTITUT D ELECTRONIQUE   (France)

Author keywords

[No Author keywords available]

Indexed keywords

ATOMIC FORCE MICROSCOPY; DEFECTS; ELECTRONIC STRUCTURE; NATURAL FREQUENCIES; PHONONS; RAMAN SPECTROSCOPY;

FLAKES; GRAPHENE; SPECTRAL DATA; TRANSLATIONAL SYMMETRY;

GRAPHITE;

EID: 33847762932     PISSN: 15306984     EISSN: None     Source Type: Journal    
DOI: 10.1021/nl061702a     Document Type: Article

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25. 7 overcome this difficulty by using the semiempirical parameter dω/dq (caption of Table I of ref 7), which is fitted to the experimental dispersion of the D′ peak. We have avoided the use of this semiempirical parameter in order to assess the quantitative validity of the double-resonant Raman model based on first-principles calculations. The good agreement between experimental and theoretical D peak dispersion in ref 6 is based on a corresponding fit of the hopping parameter in the tight-binding band structure and on the parametrization of the phonon dispersion relation.
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29. We note that the picture of independent electron-hole pair excitations has been quantitatively very successful for the assignment of nanotube spectra to the chiral indices (m,n). However, this success was based on the use of tight-binding band structures with correspondingly fitted parameters. A parameter-free, first-principles calculation of the optical spectra of carbon nanotubes must take into account electron-electron and electron-hole interaction, and we suggest that this may be true for graphite as well.