@article{KramerRodriguezZelinskyi, author = {Kramer, Tobias and Rodriguez, Mirta and Zelinskyi, Yaroslav}, title = {Modeling of Transient Absorption Spectra in Exciton Charge-Transfer Systems}, series = {Journal of Physical Chemistry B}, volume = {121}, journal = {Journal of Physical Chemistry B}, doi = {10.1021/acs.jpcb.6b09858}, pages = {463 -- 470}, abstract = {Time-resolved spectroscopy provides the main tool for analyzing the dynamics of excitonic energy transfer in light-harvesting complexes. To infer time-scales and effective coupling parameters from experimental data requires to develop numerical exact theoretical models. The finite duration of the laser-molecule interactions and the reorganization process during the exciton migration affect the location and strength of spectroscopic signals. We show that the non-perturbative hierarchical equations of motion (HEOM) method captures these processes in a model exciton system, including the charge transfer state.}, language = {en} } @article{KramerRodriguez, author = {Kramer, Tobias and Rodriguez, Mirta}, title = {Two-dimensional electronic spectra of the photosynthetic apparatus of green sulfur bacteria}, series = {Scientific Reports}, volume = {7}, journal = {Scientific Reports}, doi = {10.1038/srep45245}, pages = {45245}, abstract = {Advances in time resolved spectroscopy have provided new insight into the energy transmission in natural photosynthetic complexes. Novel theoretical tools and models are being developed in order to explain the experimental results. We provide a model calculation for the two-dimensional electronic spectra of Cholorobaculum tepidum which correctly describes the main features and transfer time scales found in recent experiments. From our calculation one can infer the coupling of the antenna chlorosome with the environment and the coupling between the chlorosome and the Fenna-Matthews-Olson complex. We show that environment assisted transport between the subunits is the required mechanism to reproduce the experimental two-dimensional electronic spectra.}, language = {en} }