A new angle on the well-known FMO photosynthetic complex

Abstract: Using a formalism adapted to study transport in quantum open systems, that is the nonequilibrium Green's function formalism, we revisit the working principle of the most popular photosynthetic complex, namely the Fenna Matthews-Olson complex. We underline the driving force behind the exciton flow. We also show that in a realistic parameter regime, two mechanisms, one of which has not yet been proposed, may be at work to protect the reaction center from overheating.