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MO: Fachverband Molekülphysik

MO 21: Coupled Systems

MO 21.5: Vortrag

Donnerstag, 14. März 2019, 15:15–15:30, S HS 001 Biologie

Near field induced speedup of exciton diffusion in light-harvesting arrays — •Andrea Mattioni, Felipe Caycedo-Soler, Susana Huelga, and Martin Plenio — Institut für Theoretische Physik and Center for Integrated Quantum Science and Technology IQST, Albert-Einstein-Allee 11, Universität Ulm, 89069 Ulm, Germany

The observation of long-range energy propagation along nano-engineered arrays of bacterial antenna complexes [Nano Lett., 2010, 10 (4), pp 1450–1457] has been recurrently addressed as a result of ballistic, hence, coherent propagation [J. Phys. Chem. C, 2012, 116 (5), pp 3747–3756]. We show that the experimentally determined quantities relevant for these dynamics hinder the formation of large coherent domains and inevitably lead to classical diffusion in these densely packed arrays, which nevertheless benefit from the spectral complexity of single antenna complexes and near field interactions to result in the propagation observed. We show that the packing density bridges the apparent incompatibility between observed energy transfer rates in bacterial photosynthetic membranes and nano-engineered antenna arrays, which together with exciton delocalization across individual antennas and non-equilibrium transport, provides useful design strategies to optimize energy transfer in the presence of typical room temperature conditions.