Journal
SCIENCE
Volume 323, Issue 5912, Pages 369-373Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1164016
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Funding
- E. W. R. Steacie Memorial Fellowship
- Natural Sciences and Engineering Research Council of Canada
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The intermediate coupling regime for electronic energy transfer is of particular interest because excitation moves in space, as in a classical hopping mechanism, but quantum phase information is conserved. We conducted an ultrafast polarization experiment specifically designed to observe quantum coherent dynamics in this regime. Conjugated polymer samples with different chain conformations were examined as model multichromophoric systems. The data, recorded at room temperature, reveal coherent intrachain (but not interchain) electronic energy transfer. Our results suggest that quantum transport effects occur at room temperature when chemical donor-acceptor bonds help to correlate dephasing perturbations.
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