Kohn anomalies in graphene nanoribbons
Name
Sasaki-2009-Kohn anomalies in graphene nanoribbons.pdf
Size
590.39 KB
Format
Adobe PDF
Checksum (MD5)
9c6e3dab670e6c6c89faaa0d3486e90a
Author(s)
Dresselhaus, Mildred
Wakabayashi, Katsunori
Enoki, Toshiaki
Mori, Takanori
Takai, Kazuyuki
Saito, Riichiro
Murakami, Shuichi
Yamamoto, Masayuki
Sasaki, Ken-ichi
Date Issued
October 2009
Journal
Physical Review B
Publisher
American Physical Society
Citation
Sasaki, Ken-ichi et al. “Kohn anomalies in graphene nanoribbons.” Physical Review B 80.15 (2009): 155450. © 2009 The American Physical Society
Version
Final published version
Abstract
The quantum corrections to the energies of the Γ point optical phonon modes (Kohn anomalies) in graphene nanoribbons (NRs) are investigated. We show theoretically that the longitudinal optical (LO) modes undergo a Kohn anomaly effect, while the transverse optical (TO) modes do not. In relation to Raman spectroscopy, we show that the longitudinal optical modes are not Raman active near the zigzag edge, while the transverse optical modes are not Raman active near the armchair edge. These results are useful for identifying the orientation of the edge of graphene nanoribbons by G band Raman spectroscopy, as is demonstrated experimentally. The differences in the Kohn anomalies for nanoribbons and for metallic single-wall nanotubes are pointed out, and our results are explained in terms of pseudospin effects.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
http://dx.doi.org/10.1103/PhysRevB.80.155450
