Abstract
We investigate coherent dynamics in the cryptophyte light-harvesting complex Phycocyanin-645 (PC-645). A two-colour four-wave mixing experiment allows us to isolate a coherence pathway and observe its evolution in the absence of other signals. We measured a decoherence time of 540fs for the coherence [1]. Additionally oscillations in the signal pathway give evidence for the coherent excitation of states outside the bandwidth of the laser pulse. This suggests strong coupling between the excited states and phonon modes [1].
Highlights
Long-lived coherences, that persist for time-scales relevant to energy transfer, have been demonstrated in light-harvesting complexes using two-dimensional spectroscopy experiments [2,3]
To gain more insight into these light-harvesting complexes we have developed a two-colour photon echo spectroscopy
The experiment will not be sensitive to the type of coherent oscillations identified by previous two-dimensional spectroscopy, as we are measuring the intensity rather than electric field
Summary
Long-lived coherences, that persist for time-scales relevant to energy transfer, have been demonstrated in light-harvesting complexes using two-dimensional spectroscopy experiments [2,3]. Oscillations in the signal pathway give evidence for the coherent excitation of states outside the bandwidth of the laser pulse. This suggests strong coupling between the excited states and phonon modes [1].
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