Dresden 2020 – wissenschaftliches Programm
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CPP 9.4: Vortrag
Montag, 16. März 2020, 10:15–10:30, POT 112
Exciton dispersion in rubrene single crystals — •Tobias Lettmann and Michael Rohlfing — Institut für Festkörpertheorie, Westfälische Wilhelms-Universität Münster, 48149 Münster
Rubrene single crystals are proposed as components of various organic (opto-)electronic devices. Their electronic (quasiparticle) bandstructure shows an anisotropic behaviour with a relatively strong dispersion of several 100 meV along the Γ-Y direction, whereas the bands are almost flat along the Γ-X direction .
Corresponding to the electronic bands, excitons can also exhibit dispersion of their excitation energies as a function of their total momentum (related to their centre-of-mass motion). This dispersion and its anisotropy might be relevant for excitonic hopping transport. In this talk we use the GW/BSE approach of many-body perturbation theory (MBPT) to calculate the excitonic bandstructure of rubrene single crystals in order to investigate if the anisotropy is still present or mitigated by excitonic effects.
 S. Yanagisawa et al., Phys. Rev. B 88, 115438 (2013)