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Frequency-Dependent Vibronic Effects in Steady State Energy Transport
Leonardo F Calderón1,2, Paul Brumer1
1Chemical Physics Theory Group, Department of Chemistry, and Center for Quantum Information and Quantum Control, University of Toronto, Toronto, Ontario M5S 3H6, Canada.
The Journal of Physical Chemistry. B
|July 25, 2024
Summary
Vibrational frequencies in light-harvesting systems do not significantly enhance energy transport in natural nonequilibrium states. Optimizing energy transfer may involve increasing harvesting time at the reaction center.
Area of Science:
- Photosynthesis
- Biophysics
- Quantum Biology
Background:
- Natural light-harvesting systems utilize electronic and vibrational energy transfer.
- Previous research suggested vibrational frequency differences enhance energy transport.
- The role of vibrational frequencies in nonequilibrium steady states remains unclear.
Purpose of the Study:
- To analyze how intramolecular vibrational frequencies affect excitation energy transport.
- To compare energy transport in nonequilibrium steady states versus equilibrium conditions.
- To investigate mechanisms for optimizing energy transfer in natural light-harvesting.
Main Methods:
- Theoretical analysis of excitation energy transport.
- Modeling of donor-acceptor vibrational frequencies.
- Simulation of nonequilibrium steady states and equilibrium cases.
- Inclusion of biologically relevant parameters for photosynthetic complexes.
Main Results:
- In equilibrium, higher acceptor vibrational frequencies increase acceptor population.
- This increase is negligible in the nonequilibrium steady state.
- Vibrational frequency differences do not significantly enhance energy transport in natural light-harvesting under incoherent excitation.
- Harvesting time at the reaction center is identified as a potential optimization mechanism.
Conclusions:
- Intramolecular vibrational frequencies have a limited impact on energy transport efficiency in natural light-harvesting nonequilibrium steady states.
- Optimizing energy transfer may depend on factors beyond vibrational frequency matching, such as extended harvesting times.
- Findings provide insight into the dynamics of natural light-harvesting complexes.
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