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Materials 2018, 11(11), 2219;

Dynamics of Frenkel Excitons in Pentacene

Department of Physics, Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovića 4, 21000 Novi Sad, Serbia
Author to whom correspondence should be addressed.
Received: 29 September 2018 / Revised: 31 October 2018 / Accepted: 6 November 2018 / Published: 8 November 2018
(This article belongs to the Special Issue Advanced Nanostructures for Photonics and Photovoltaics)
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The dispersion relation for noninteracting excitons and the influence of perturbative corrections are examined in the case of pentacene structure. The values of exchange integrals are determined by nonlinear fits to the experimental dispersion data, obtained by the inelastic electron scattering reported in recent experiments. We obtain theoretical dispersion curves along four different directions in the Brillouin zone which possess the same periodicity as the experimental data. We also show that perturbative corrections are negligible since the exciton gap in the dispersion relation is huge in comparison to the exchange integrals. View Full-Text
Keywords: Frenkel excitons; Heisenberg model; effective field theory; exciton-exciton interactions Frenkel excitons; Heisenberg model; effective field theory; exciton-exciton interactions

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Gombar, S.; Mali, P.; Pantić, M.; Pavkov-Hrvojević, M.; Radošević, S. Dynamics of Frenkel Excitons in Pentacene. Materials 2018, 11, 2219.

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