Regensburg 2010 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 5: Ultra-fast Phenomena
HL 5.1: Talk
Monday, March 22, 2010, 10:15–10:30, H17
Microscopic description 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 up 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 optical transition energies of pigments in protein environments and the spectral density of exciton-vibrational coupling [3]. Furthermore, the influences of inhomogeneous broadening of transition energies are discussed.
[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)