First and second optical transitions in single-walled carbon nanotubes: a resonant Raman study

被引：6
|
作者：
Telg, H.
Maultzsch, J.
Reich, S.
Thomsen, C.
机构：
[1] Tech Univ Berlin, Inst Festkorperphys, D-10623 Berlin, Germany
[2] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA
来源：
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2007年 / 244卷 / 11期
关键词：
D O I：
10.1002/pssb.200776141
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Resonant Raman spectroscopy was performed to study electron-phonon coupling in single-walled carbon nanotubes separated in solution. By varying the excitation energy from 1.26 eV to 1.93 eV we obtained radial breathing mode resonance profiles of the first and second optical transitions E, and E2, of the (9, 1) and (8,3) tubes. We observe up to 16 times stronger Raman intensities for the E, transitions which can mostly be attributed to a two times broader linewidth of the E-22 transition. Comparison of the matrix element ratio M-11/M-22 to theoretical predictions on the electron-phonon coupling show a deviation of a factor 1.7 which might-be associated with the change of the exciton-photon matrix element. (c) 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
引用
收藏
页码：4006 / 4010
页数：5
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