Time dependent relaxation of photoexcited states in polyacetylene |
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| Affiliation: | 1. Instituto de Ciências Exatas e Tecnológicas, Universidade Federal de Viçosa, 38810-000 Rio Paranaíba, MG, Brazil;2. Department of Physics, Texas State University, 78666 San Marcos, TX, USA;1. School of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Key Laboratory of Materials Processing Technology of MOE, Tsinghua University, Beijing 100084, China;2. Center for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, China;3. National Center for Nanoscience and Technology, Zhongguancun, Beijing 100190, China;4. Department of Thermal Engineering, Tsinghua University, Beijing 100084, China;5. School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore;6. Tsinghua National Laboratory for Information Science and Technology (TNList), Institute of Microelectronics, Tsinghua University, Beijing 100084, China |
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| Abstract: | We present the results obtained by numerical simulation of the time behaviour, in the long time regime, of the transient photoinduced bleaching. The polymeric chain is assumed to be formed by conjugated segments of different length, whose distribution is derived by the resonant Raman scattering spectra interpretation. The kinetics of the photoinduced carriers is simulated through a random walk over a sequence of conjugated segments, separated by temperature dependent barriers with randomly distributed heights. The numerical simulation is able to determine a power law behaviour t−α as observed experimentally in the picosecond regime (50–1000 ps) with α decreasing as function of temperature. |
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