TY - GEN
T1 - Band-gap modulation and Kohn anomalies in two-dimensional graphite and single-wall carbon nanotubes
AU - Samsonidze, Georgii G.
AU - Barros, Eduardo B.
AU - Son, Hyungbin
AU - Saito, Riichiro
AU - Dresselhaus, Gene
AU - Dresselhaus, Mildred S.
PY - 2006/1/1
Y1 - 2006/1/1
N2 - 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.
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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U2 - 10.1557/proc-0963-q01-06
DO - 10.1557/proc-0963-q01-06
M3 - Conference contribution
AN - SCOPUS:40949088130
SN - 9781604234152
T3 - Materials Research Society Symposium Proceedings
SP - 43
EP - 48
BT - Nanowires and Carbon Nanotubes
PB - Materials Research Society
T2 - 2006 MRS Fall Meeting
Y2 - 27 November 2006 through 29 November 2006
ER -