High-energy phonon branches of an individual metallic carbon nanotube

被引：50

作者：

Maultzsch, J

Reich, S

Schlecht, U

Thomsen, C

机构：

[1] Tech Univ Berlin, Inst Festkorperphys, D-10623 Berlin, Germany

[2] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 91卷 / 08期

关键词：

D O I：

10.1103/PhysRevLett.91.087402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present excitation-energy dependent Raman measurements between 2.05 and 2.41 eV on the same individual carbon nanotube. We find a change in the Raman frequencies of both the D mode (63 cm(-1)/eV) and the high-energy modes. The observed frequencies of the modes at approximate to1600 cm(-1) as a function of laser-energy map the phonon dispersion relation of a metallic tube near the Gamma point of the Brillouin zone. Our results prove the entire first-order Raman spectrum in single-wall carbon nanotubes to originate from double-resonant scattering. Moreover, we confirm experimentally the phonon softening in metallic tubes by a Peierls-like mechanism.

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页数：4

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