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Band-Gap Modulation and Kohn Anomalies in Two-Dimensional Graphite and Single-Wall Carbon Nanotubes

Published online by Cambridge University Press:  01 February 2011

Georgii Samsonidze ,
Eduardo B. Barros ,
Hyungbin Son ,
Riichiro Saito ,
Gene Dresselhaus  and
Mildred S. Dresselhaus
Georgii Samsonidze
Affiliation:
gsm@mgm.mit.edu, Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 77 Massachusetts Ave., Room 13-3021, Cambridge, MA, 02139, United States, 617-253-6860, 617-253-6827
Eduardo B. Barros
Affiliation:
ebarros@flex.phys.tohoku.ac.jp, Universidade Federal do Ceara, Fortaleza, 60455-760, Brazil
Hyungbin Son
Affiliation:
being@mit.edu, Massachusetts Institute of Technology, Cambridge, MA, 02139, United States
Riichiro Saito
Affiliation:
rsaito@flex.phys.tohoku.ac.jp, Tohoku University and CREST JST, Sendai, 980-8578, Japan
Gene Dresselhaus
Affiliation:
gene@mgm.mit.edu, Massachusetts Institute of Technology, Cambridge, MA, 02139, United States
Mildred S. Dresselhaus
Affiliation:
millie@mgm.mit.edu, Massachusetts Institute of Technology, Cambridge, MA, 02139, United States
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Abstract

The electron-phonon coupling in two-dimensional graphite (graphene sheet) and metallic single-wall carbon nanotubes (SWNTs) is analyzed. In the graphene sheet the G-band phonon mode induces oscillations of the Fermi points, while the G′-band phonon mode opens a dynamical (oscillating with the phonon frequency) band gap, and accordingly, both phonon modes exhibit Kohn anomalies. Similarly, truly metallic armchair SWNTs undergo Peierls transitions driven by the G−- and G′-band phonon modes both of which open a dynamical band gap. In addition, the dynamical band gap induces a non-linear dependence of the phonon frequencies on the doping level and gives rise to strong anharmonic effects in the graphene sheet and metallic SWNTs.

Keywords

nanostructureRaman spectroscopythermal conductivity
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 963: Symposium Q – Nanowires and Carbon Nanotubes – Science and Applications , 2006 , 0963-Q01-06
Copyright
Copyright © Materials Research Society 2007

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References

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