Abstract
Fenna-Matthews-Olson (FMO) bacteriochlorophylls (BChls) are molecules responsible of the high efficiency energy transfer in the photosynthetic process of green sulfur bacteria, controversially associated to quantum phenomena of long lived coherence. This phenomenon is modelled using Quantum Open Systems (QOS) without include memory effects of the surrounding approximated as a phonon bath on thermal equilibrium. This work applies the Hierarchical Equations of Motion method (HEOM), a non-Markovian approach, in the modelling of the system evolution of FMO complex to perform predictions about the coherence times scales together with global and semi-local entanglement during the quantum excitation.
Highlights
FMO complexes and their quantum dynamics simulation Photosynthetic bacteria have evolved to transform sun energy into biochemical energy through physicochemical mechanisms carried out in specialized chemical structures, the FMO complex (Figure 1), a protein structure responsible of energy transfer with a nearly 100% efficiency from the Light Harvesting Antennas (LHA) to the reaction center (RC) in green sulphur bacteria [1]
Hierarchical Equations of Motion method (HEOM) method was used to model the dynamic evolution of the eight BChls in one monomer of the FMO complex at room temperature depicting the boost of long-live coherences via localized entanglement, first among BChls 1, 2, 8 and transferred to the remainder BChls conducting to the final populations in BChls 3 and 4 exiting the energy to the RC
Reorganization energy λk values suggest an important role in the time scale and the behavior of such coherence phenomena possibly related with the strains efficiency exhibited in their spectroscopic characterization
Summary
FMO complexes and their quantum dynamics simulation Photosynthetic bacteria have evolved to transform sun energy into biochemical energy through physicochemical mechanisms carried out in specialized chemical structures, the FMO complex (Figure 1), a protein structure responsible of energy transfer with a nearly 100% efficiency from the Light Harvesting Antennas (LHA) to the reaction center (RC) in green sulphur bacteria [1]. Ultrafast spectroscopic studies reveal long time quantum coherence between the electronic states of the BChls [2], a mechanism of high transfer efficiency sampling the energy space through the excitonic superposition.
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