title: Energy-scales convergence for optimal and robust quantum transport in photosynthetic complexes.
abstract: Underlying physical principles for the high efficiency of excitation energy transfer in light-harvesting complexes are not fully understood. Notably, the degree of robustness of these systems for transporting energy is not known considering their realistic interactions with vibrational and radiative environments within the surrounding solvent and scaffold proteins. In this work, we employ an efficient technique to estimate energy transfer efficiency of such complex excitonic systems. We observe that the dynamics of the Fenna-Matthews-Olson (FMO) complex leads to optimal and robust energy transport due to a convergence of energy scales among all important internal and external parameters. In particular, we show that the FMO energy transfer efficiency is optimum and stable with respect to important parameters of environmental interactions including reorganization energy λ, bath frequency cutoff γ, temperature T, and bath spatial correlations. We identify the ratio of kBλT/ℏγ⁢g as a single key parameter governing quantum transport efficiency, where g is the average excitonic energy gap.
authors: Google Research, Venice, California 90291, USA.
authors: M
authors: M
authors: Mohseni
authors: Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA.
authors: A
authors: A
authors: Shabani
authors: Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors: S
authors: S
authors: Lloyd
authors: Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA.
authors: H
authors: H
authors: Rabitz
mesh_terms: D001426:Bacterial Proteins / Q000737:chemistry*; D041883:Chlorobium / Q000737:chemistry*; D004735:Energy Transfer; D045342:Light-Harvesting Protein Complexes / Q000737:chemistry*; D008958:Models, Molecular; D013696:Temperature
chemical_list: D001426:Bacterial Proteins; C086320:FMO bacteriochlorophyll protein, Bacteria; D045342:Light-Harvesting Protein Complexes