Regensburg 2013 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 32: Poster: Organic Semiconductors
CPP 32.9: Poster
Mittwoch, 13. März 2013, 16:30–18:30, Poster C
Vibronic spectra of excitons in 2-D polyacene lattices — •Christoph Warns1, Thomas Hartmann1, Ivan Lalov2,1, and Peter Reineker1 — 1Institute for Theoretical Physics, Ulm University, 89069 Ulm, Germany — 2Faculty of Physics, Sofia University, Sofia 1164, Bulgaria
Vibronic spectra of excitons in various 2-dimensional lattices, which model the (ab)-plane of polyacene crystals, have been investigated. We have considered interacting FEs and molecular vibrations, taking into account linear and quadratic coupling. The linear optical susceptibility of the 2-D crystal was calculated using the Green's function method and the vibronic approach. Various 2-D crystal lattices were assumed: actual anthracene, tetracene and pentacene crystal lattices, a hypothetical graphene-like lattice, all with two molecules per unit cell, and a simple hexagonal lattice with only one molecule per unit cell. In the computation of the vibronic spectra we used the measured excitonic and vibrational parameters of polyacene crystals (based on data by Petelenz et al.).