Ultrafast exciton dynamics in semiconducting single-walled carbon nanotubes

被引：19
作者：
Ma, YZ
Valkunas, L
Dexheimer, SL
Fleming, GR [1 ]
机构：
[1] Univ Calif Berkeley, Lawrence Berkeley Lab, Phys Biosci Div, Berkeley, CA 94720 USA
[2] Inst Phys, LT-02300 Vilnius, Lithuania
[3] Vilnius State Univ, Fac Phys, Dept Theoret Phys, LT-10222 Vilnius, Lithuania
[4] Washington State Univ, Dept Phys, Pullman, WA 99164 USA
来源：
MOLECULAR PHYSICS | 2006年 / 104卷 / 08期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1080/00268970500525564
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
To define the origin of the electronic excited states of single-walled carbon nanotubes, femtosecond fluorescence up-conversion and frequency-resolved transient absorption measurements were used for selective excitation/probing of particular nanotubes in a micelle-dispersed preparation enriched with individual nanotubes. Analysis of the temporal and intensity profiles of the transient signals enable one to unambiguously identify the excitonic nature of elementary excitations in semiconducting nanotubes, and the predominant dynamical process as a remarkable manifestation of exciton-exciton annihilation. These studies convincingly support the conclusion that the longest wavelength electronic excitations are of excitonic origin. In addition, evidence is shown for bi-exciton formation in single walled nanotubes.
引用
收藏
页码：1179 / 1189
页数：11
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