Reduced density matrix hybrid approach: application to electronic energy transfer

Area of Science:

• Quantum dynamics
• Condensed matter physics
• Photosynthesis research

Background:

• Electronic energy transfer in condensed phases, crucial for processes like photosynthesis, often involves similar energy scales between the system and its environment.
• Theoretical modeling of these systems is challenging due to limitations of existing methods in such energetic regimes.

Purpose of the Study:

• To develop a robust theoretical framework for describing electronic energy transfer in challenging condensed-phase environments.
• To accurately simulate energy transfer dynamics in photosynthetic complexes and model systems.

Main Methods:

• Utilizing the Ehrenfest approach to handle coupling with slow environmental modes.
• Employing a reduced density matrix hybrid framework to quantum mechanically treat faster environmental modes via a perturbative master equation.

Main Results:

• The combined Ehrenfest and reduced density matrix approach provides an efficient and quantitative description of electronic energy transfer.
• The method accurately models energy transfer in a model dimer and the Fenna-Matthews-Olson complex.
• Investigated the impact of environmental preparation on the resulting energy transfer dynamics.

Conclusions:

• The developed hybrid quantum-classical method offers a significant advancement for studying electronic energy transfer in complex systems.
• This approach is particularly effective in regimes where system and environmental energy scales are comparable, overcoming limitations of traditional methods.