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Excitons in chains of dimers (1996).
| Content Provider | CiteSeerX |
|---|---|
| Author | Liuolia, Vladas Valkunas, Leonas Grondelle, Rienk Van |
| Abstract | Excitons in circular aggregates of dimers are discussed with the aim to understand the possible spectral and energy transfer properties of the ringlike peripheral complexes of photosynthetic bacteria. The system is explicitly heterogeneous (i.e., the difference in transition energies of the molecules within the dimer as, well as the difference in the intra- and interdimer resonance interactions, is accounted for). It is demonstrated that the energy spectrum of such a system exhibits many of the features as observed in spectrally inhomogeneous circular aggregates. The model is used to illustrate the changes in absorption and circular dichroism spectra that take place upon incorporating a dimer into a circular chain. The exciton dynamics in the aggregate is considered in the Haken-Strobl-Reineker approach. When terms are neglected describing the phase relaxation between nonnearest neighbors, the equations for the diagonal density matrix elements are obtained containing both coherent exciton motion within the dimersthe building block of the aggregatesand an incoherent hopping of the excitation between dimers. It is demonstrated that these equations contain a wavelike soliton solution (if dephasing is absent) as well as a diffusion-like solution (for large dephasing rates). |
| File Format | |
| Publisher Date | 1996-01-01 |
| Access Restriction | Open |
| Subject Keyword | Wavelike Soliton Solution Transition Energy Coherent Exciton Motion Ringlike Peripheral Complex Diagonal Density Matrix Element Circular Aggregate Circular Dichroism Incoherent Hopping Circular Chain Inhomogeneous Circular Aggregate Haken-strobl-reineker Approach Dimersthe Building Block Exciton Dynamic Photosynthetic Bacteria Energy Spectrum Energy Transfer Property Phase Relaxation Diffusion-like Solution Interdimer Resonance Interaction |
| Content Type | Text |
