Excitation spectrum for ultrafast photogeneration of charged solitons in polyacetylene
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2002-09-15
Autores
Miranda, P. B.
Moses, D.
Heeger, A. J.
Park, Y. W.
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American Physical Soc
Resumo
Ultrafast photoinduced absorption by infrared-active vibrational modes is used to detect charged solitons in oriented trans-polyacetylene. Soliton pairs are photogenerated within similar to250 fs with quantum efficiencies (phi(ch)) approaching unity. The excitation spectrum of phi(ch) shows an onset at similar to1.0 eV with a weak photon energy dependence up to 4.7 eV. The results are consistent with the ultrafast soliton formation predicted by Su and Schrieffer and with the Su-Scrieffer-Heeger threshold of 2E(g)/pi for soliton pair production. The recombination dynamics of charged solitons is very fast (initial decay<1 ps) with a modest dependence on the pump photon energy.
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Physical Review B. College Pk: American Physical Soc, v. 66, n. 12, 5 p., 2002.