Phonon softening in individual metallic carbon nanotubes due to the Kohn anomaly

被引：137

作者：

Farhat, H. ^{[1
]}

Son, H.

Samsonidze, Ge. G.

Reich, S.

Dresselhaus, M. S.

Kong, J.

机构：

[1] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA

[2] MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA

[3] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[4] Free Univ Berlin, Fachbereich Phys, D-14195 Berlin, Germany

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 14期

关键词：

D O I：

10.1103/PhysRevLett.99.145506

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have studied the line shape and frequency of the G band Raman modes in individual metallic single walled carbon nanotubes (M-SWNTs) as a function of Fermi level (epsilon(F)) position, by tuning a polymer electrolyte gate. Our study focuses on the data from M-SWNTs where explicit assignment of the G(-) and G(+) peaks can be made. The frequency and line shape of the G(-) peak in the Raman spectrum of M-SWNTs is very sensitive to the position of the Fermi level. Within +/- h omega/2 (where h omega is the phonon energy) around the band crossing point, the G(-) mode is softened and broadened. In contrast, as the Fermi level is tuned away from the band crossing point, a semiconductinglike G band line shape is recovered both in terms of frequency and linewidth. Our results confirm the predicted softening of the A-symmetry LO phonon mode frequency due to a Kohn anomaly in M-SWNTs.

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页数：4

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