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

被引：112

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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