Excitation spectrum for ultrafast photogeneration of charged solitons in polyacetylene

被引：1
|
作者：
Miranda, PB
Moses, D
Park, YW
Heeger, AJ [1 ]
机构：
[1] Univ Calif Santa Barbara, Ctr Polymers & Organ Solids, Santa Barbara, CA 93106 USA
[2] Univ Estadual Paulista, Dept Fis, Fac Ciencias, BR-17015970 Bauru, SP, Brazil
[3] Seoul Natl Univ, Sch Phys, Seoul 151747, South Korea
来源：
SYNTHETIC METALS | 2003年 / 135卷 / 1-3期
关键词：
time-resolved fast spectroscopy; photoinduced absorption spectroscopy; polyacetylene and derivatives; semiconducting films; tensile drawing; photoconductivity;
D O I：
10.1016/S0379-6779(02)00600-8
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Ultrafast photoinduced absorption by IRAV modes is used to detect charged solitons in oriented polyacetylene. We find that soliton pairs are photogenerated within our time resolution of similar to250 fs with similar to100% quantum efficiency (phi(ch)). The excitation spectrum of phi(ch) shows an onset at 1.0 eV, with a weak photon energy dependence up to 4.7 eV. These results agree with the ultrafast soliton formation predicted by Su and Schrieffer and with the SSH threshold of 2E(g)/pi for soliton pair production.
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页码：445 / 446
页数：2
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