Extended Delocalization Directs Absorption in Purple Bacteria
In photosynthetic purple bacteria, efficient excitation energy transfer from light harvesting (LH) units to the reaction center (RC), where charge separation powers metabolism, benefits from delocalization within single LH units or the RC. We show experimentally and theoretically that extended delocalization over multiple structures is important on the short time scale of absorption, as it generates an appreciable increase in direct absorption at the RC. Interestingly, the requirements for directed absorption are different from those for fast transfer, hence we argue the processes are independent, albeit complementary, facilitators of charge separation.
Host: Luis Orozco
Subscribe to A Quantum Bit
Quantum physics began with revolutionary discoveries in the early twentieth century and continues to be central in today’s physics research. Learn about quantum physics, bit by bit. From definitions to the latest research, this is your portal. Subscribe to receive regular emails from the quantum world. Previous Issues...
Sign Up Now
Sign up to receive A Quantum Bit in your email!