Variable electron-phonon coupling in isolated metallic carbon nanotubes observed by Raman scattering

被引：108
|
作者：
Wu, Yang
Maultzsch, Janina
Knoesel, Ernst
Chandra, Bhupesh
Huang, Mingyuan
Sfeir, Matthew Y.
Brus, Louis E.
Hone, J.
Heinz, Tony F.
机构：
[1] Columbia Univ, Dept Phys, New York, NY 10027 USA
[2] Columbia Univ, Dept Elect Engn, New York, NY 10027 USA
[3] Rowan Univ, Dept Phys, Glassboro, NJ 08028 USA
[4] Columbia Univ, Dept Mech Engn, New York, NY 10027 USA
[5] Columbia Univ, Dept Chem, New York, NY 10027 USA
来源：
PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 02期
关键词：
D O I：
10.1103/PhysRevLett.99.027402
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We report the existence of broad and weakly asymmetric features in the high-energy (G) Raman modes of freely suspended metallic carbon nanotubes of defined chiral index. A significant variation in peak width (from 12 cm(-1) to 110 cm(-1)) is observed as a function of the nanotube's chiral structure. When the nanotubes are electrostatically gated, the peak widths decrease. The broadness of the Raman features is understood as the consequence of coupling of the phonon to electron-hole pairs, the strength of which varies with the nanotube chiral index and the position of the Fermi energy.
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页数：4
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