Pseudospin for Raman D Band in Armchair Graphene Nanoribbons

Details Pseudospin for Raman D Band in Armchair Graphene Nanoribbons Pseudospin for Raman D Band in Armchair Graphene Nanoribbons

2011-12-21

arxiv.org/abs/1112.4931v2

Phys. Rev. B 85, 075437 (2012)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

25 pages, 5 figures

Scientific paper

10.1103/PhysRevB.85.075437

By analytically constructing the matrix elements of an electron-phonon interaction for the $D$ band in the Raman spectra of armchair graphene nanoribbons, we show that pseudospin and momentum conservation result in (i) a $D$ band consisting of two components, (ii) a $D$ band Raman intensity that is enhanced only when the polarizations of the incident and scattered light are parallel to the armchair edge, and (iii) the $D$ band softening/hardening behavior caused by the Kohn anomaly effect is correlated with that of the $G$ band. Several experiments are mentioned that are relevant to these results. It is also suggested that pseudospin is independent of the boundary condition for the phonon mode, while momentum conservation depends on it.

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