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HL: Fachverband Halbleiterphysik
HL 82: Ultrafast Phenomena
HL 82.8: Talk
Thursday, March 17, 2011, 16:30–16:45, POT 251
Microscopical calculation of non-linear polarization spectra of light-harvesting complexes — •Mario Schoth1, Marten Richter1, Thomas Renger2, and Andreas Knorr1 — 1Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin, Germany — 2Institut für Theoretische Physik, Theoretische Biophysik, Johannes Kepler Universität Linz, Austria
Ultrafast spectroscopic techniques, such as nonlinear polarization spectroscopy [1], are used to investigate photosynthetic systems of higher plants. Performed in the frequency domain, non-linear polarization spectroscopy (NLPF) permits simultaneous measurements of dephasing and energy relaxation rates down to tens of femtoseconds. Within a Bloch equation approach [2], we calculate NLPF spectra of light-harvesting complexes such as the water-soluble chlorophyll binding protein complex (WSCP) microscopically. Hereby, we include self-consistently structural data for the excitonic couplings of pigments and the spectral density of exciton-vibrational coupling [3]. Furthermore we show that NLPF is suited to compensate effects of inhomogeneous broadening.
[1] W. Beenken, V. May, J. Opt. Soc. Am. B. 14, 11, 2804 – 2810 (1997)
[2] M. Richter, T. Renger, G. Renger, A. Knorr, J. Chem. Phys. 127, 075105 (2007)
[3] T. Renger et al., J. Phys. Chem. B, 111, 10487 – 10501 (2007)