Exciton-phonon information flow in the energy transfer process of photosynthetic complexes

Abstract

Non-Markovian and non-equilibrium phonon effects are believed to be key ingredients in the energy transfer in photosynthetic complexes, especially in complexes which exhibit a regime of intermediate exciton-phonon coupling. In this work, we utilize a recently-developed measure for non-Markovianity to elucidate the exciton-phonon dynamics in terms of the information flow between electronic and vibrational degrees of freedom. We study the measure in the hierarchical equation of motion approach which captures strong system-bath coupling effects and non-equilibrium molecular reorganization. We propose an additional trace-distance measure for the information flow that could be extended to other master equations. We find that for a model dimer system and the Fenna-Matthews-Olson complex that non-Markovianity is significant under physiological conditions.

4 pages, 2 figures

References in corpus (7)

• Assessing non-Markovian dynamics
• Role of quantum coherence in chromophoric energy transport
• Non-Markovian quantum jumps
• Enhanced quantum entanglement in the non-Markovian dynamics of biomolecular excitons
• Modified-scaled hierarchical equation of motion approach for the study of quantum coherence in photosynthetic complexes
• Kraus representation of quantum evolution and fidelity as manifestations of Markovian and non-Markovian avataras
• Influence of Complex Exciton-Phonon Coupling on Optical Absorption and Energy Transfer of Quantum Aggregates