Band-gap modulation and Kohn anomalies in two-dimensional graphite and single-wall carbon nanotubes

Georgii G. Samsonidze; Eduardo B. Barros; Hyungbin Son; Riichiro Saito; Gene Dresselhaus; Mildred S. Dresselhaus

doi:10.1557/proc-0963-q01-06

Band-gap modulation and Kohn anomalies in two-dimensional graphite and single-wall carbon nanotubes

Georgii G. Samsonidze, Eduardo B. Barros, Hyungbin Son, Riichiro Saito, Gene Dresselhaus, Mildred S. Dresselhaus

SCI - Physics

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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.

Original language	English
Title of host publication	Nanowires and Carbon Nanotubes
Subtitle of host publication	Science and Applications
Publisher	Materials Research Society
Pages	43-48
Number of pages	6
ISBN (Print)	9781604234152
DOIs	https://doi.org/10.1557/proc-0963-q01-06
Publication status	Published - 2006 Jan 1
Event	2006 MRS Fall Meeting - Boston, MA, United States Duration: 2006 Nov 27 → 2006 Nov 29

Publication series

Name	Materials Research Society Symposium Proceedings
Volume	963
ISSN (Print)	0272-9172

Other

Other	2006 MRS Fall Meeting
Country	United States
City	Boston, MA
Period	06/11/27 → 06/11/29

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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Cite this

Samsonidze, G. G., Barros, E. B., Son, H., Saito, R., Dresselhaus, G., & Dresselhaus, M. S. (2006). Band-gap modulation and Kohn anomalies in two-dimensional graphite and single-wall carbon nanotubes. In Nanowires and Carbon Nanotubes: Science and Applications (pp. 43-48). (Materials Research Society Symposium Proceedings; Vol. 963). Materials Research Society. https://doi.org/10.1557/proc-0963-q01-06

Band-gap modulation and Kohn anomalies in two-dimensional graphite and single-wall carbon nanotubes. / Samsonidze, Georgii G.; Barros, Eduardo B.; Son, Hyungbin; Saito, Riichiro; Dresselhaus, Gene; Dresselhaus, Mildred S.

Nanowires and Carbon Nanotubes: Science and Applications. Materials Research Society, 2006. p. 43-48 (Materials Research Society Symposium Proceedings; Vol. 963).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Samsonidze, GG, Barros, EB, Son, H, Saito, R, Dresselhaus, G & Dresselhaus, MS 2006, Band-gap modulation and Kohn anomalies in two-dimensional graphite and single-wall carbon nanotubes. in Nanowires and Carbon Nanotubes: Science and Applications. Materials Research Society Symposium Proceedings, vol. 963, Materials Research Society, pp. 43-48, 2006 MRS Fall Meeting, Boston, MA, United States, 06/11/27. https://doi.org/10.1557/proc-0963-q01-06

Samsonidze GG, Barros EB, Son H, Saito R, Dresselhaus G, Dresselhaus MS. Band-gap modulation and Kohn anomalies in two-dimensional graphite and single-wall carbon nanotubes. In Nanowires and Carbon Nanotubes: Science and Applications. Materials Research Society. 2006. p. 43-48. (Materials Research Society Symposium Proceedings). https://doi.org/10.1557/proc-0963-q01-06

Samsonidze, Georgii G. ; Barros, Eduardo B. ; Son, Hyungbin ; Saito, Riichiro ; Dresselhaus, Gene ; Dresselhaus, Mildred S. / Band-gap modulation and Kohn anomalies in two-dimensional graphite and single-wall carbon nanotubes. Nanowires and Carbon Nanotubes: Science and Applications. Materials Research Society, 2006. pp. 43-48 (Materials Research Society Symposium Proceedings).

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AB - 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.

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