Berlin 2005 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 30: POSTER: Chemical physics

CPP 30.9: Poster

Tuesday, March 8, 2005, 16:30–18:30, Poster TU D

Absorption spectra for a model light-harvesting system using non-Markovian theories — •M. Schröder, U. Kleinekathöfer, and M. Schreiber — Institut für Physik, Technische Universität Chemnitz, 09107 Chemnitz

Different methods for obtaining the linear absorption spectrum of a simplified model of the B850 ring of the photo-synthetic system of purple bacteria are compared. Starting from a quantum master equation, the frequency domain spectrum can be obtained within linear response theory. In these quantum master equations one often decouples the population dynamics from that of the coherences (secular approximation) and neglects memory effects (Markov approximation). The absorption spectra of the ring aggregate resulting from the Redfield theory with and without secular approximation are compared to those results from a time-local and a time-nonlocal non-Markovian theory [1]. This is done without [2] and with averaging over the static disorder. Though the difference between the different levels of approximation is small after the disorder averaging, it is clearly visible for single samples.

[1] U. Kleinekathöfer, J. Chem. Phys. 121, 2505–2514 (2004).

[2] U. Kleinekathöfer, M. Schröder and M. Schreiber, J. Lumin. (in press)