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Vibration-Assisted and Vibration-Hampered Excitonic Quantum Transport
Omer Goldberg1, Yigal Meir1, Yonatan Dubi2
1Department of Physics and the Ilse Katz Center for Nanoscale Science and Technology , Ben-Gurion University of the Negev , Beer Sheva 84105 , Israel.
The Journal of Physical Chemistry Letters
|May 24, 2018
Summary
Vibrations significantly influence exciton transport in light-harvesting complexes. Global vibrations cause antiresonances, while local vibrations induce tunneling resonances, with both effects amplified by temperature.
Area of Science:
- Quantum biology
- Photophysics
- Materials science
Background:
- Exciton-vibration interplay is crucial for exciton transfer efficiency in light-harvesting systems.
- Understanding this interaction is key to designing artificial light-harvesting complexes.
Purpose of the Study:
- To theoretically investigate the impact of global and local vibrations on exciton transport dynamics.
- To analyze the influence of temperature on vibration-assisted exciton transfer.
Main Methods:
- Development of a theoretical model for exciton transport in a two-chromophore system.
- Simulation of exciton dynamics under global and localized vibrational environments.
- Analysis of transport properties as a function of chromophore energy and temperature.
Main Results:
- Global vibrations lead to exciton-polaron interference, causing antiresonances in current.
- Local vibrations result in tunneling resonances at multiples of vibration energy.
- Both phenomena are enhanced with increasing temperature, demonstrating environment-dependent transport.
Conclusions:
- Environmental vibrations can either facilitate or impede exciton transport.
- The nature of vibrations (global vs. local) dictates distinct transport mechanisms.
- Findings align with energy transfer principles in natural light-harvesting complexes.
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