1,653 research outputs found
Modelling excitonic-energy transfer in light-harvesting complexes
The theoretical and experimental study of energy transfer in photosynthesis
has revealed an interesting transport regime, which lies at the borderline
between classical transport dynamics and quantum-mechanical interference
effects. Dissipation is caused by the coupling of electronic degrees of freedom
to vibrational modes and leads to a directional energy transfer from the
antenna complex to the target reaction-center. The dissipative driving is
robust and does not rely on fine-tuning of specific vibrational modes. For the
parameter regime encountered in the biological systems new theoretical tools
are required to directly compare theoretical results with experimental
spectroscopy data. The calculations require to utilize massively parallel
graphics processor units (GPUs) for efficient and exact computations.Comment: 20 pages, submitted to the AIP conference proceedings of the Latin
American School of Physics Marcos Moshinsky (ELAF 2013
Capacity for Half-Duplex Line Networks with Two Sources
The focus is on noise-free half-duplex line networks with two sources where
the first node and either the second node or the second-last node in the
cascade act as sources. In both cases, we establish the capacity region of
rates at which both sources can transmit independent information to a common
sink. The achievability scheme presented for the first case is constructive
while the achievability scheme for the second case is based on a random coding
argument.Comment: Proceedings of the IEEE International Symposium on Information
Theory, Austin, TX, USA, June 12 - 18, 201
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