Artículos de revistas
Excitation spectrum for ultrafast photogeneration of charged solitons in polyacetylene
Fecha
2003-04-04Registro en:
Synthetic Metals. Lausanne: Elsevier B.V. Sa, v. 135, n. 1-3, p. 445-446, 2003.
0379-6779
10.1016/S0379-6779(02)00600-8
WOS:000182533700207
Autor
Univ Calif Santa Barbara
Universidade Estadual Paulista (Unesp)
Seoul Natl Univ
Institución
Resumen
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.